Navy Lasers, Railgun, and Hypervelocity
Projectile: Background and Issues for
Congress

Ronald O'Rourke
Specialist in Naval Affairs
May 27, 2016
Congressional Research Service
7-5700
www.crs.gov
R44175


Navy Lasers, Railgun, and Hypervelocity Projectile: Background and Issues for Congress

Summary
The Navy is currently developing three potential new weapons that could improve the ability of
its surface ships to defend themselves against enemy missiles—solid state lasers (SSLs), the
electromagnetic railgun (EMRG), and the hypervelocity projectile (HVP).
Any one of these new weapon technologies, if successfully developed and deployed, might be
regarded as a “game changer” for defending Navy surface ships against enemy missiles. If two or
three of them are successfully developed and deployed, the result might be considered not just a
game changer, but a revolution. Rarely has the Navy had so many potential new types of surface-
ship missile-defense weapons simultaneously available for development and potential
deployment.
Although the Navy in recent years has made considerable progress in developing SSLs, EMRG,
and HVP, a number of significant development challenges remain. Overcoming these challenges
will likely require years of additional development work, and ultimate success in overcoming
them is not guaranteed.
The issue for Congress is whether to approve, reject, or modify the Navy’s funding requests and
proposed acquisition strategies for these three potential new weapons. Potential oversight
questions for Congress include the following:
 Using currently available approaches for countering anti-ship cruise missiles
(ASCMs) and anti-ship ballistic missiles (ASBMs), how well could Navy surface
ships defend themselves in a combat scenario against an adversary such as China
that has large numbers of ASCMs (including advanced models) and ASBMs?
How would this change if Navy surface ships in coming years were equipped
with SSLs, EMRG, HVP, or some combination of these systems?
 How significant are the remaining development challenges for SSLs, EMRG, and
HVP?
 Are current schedules for developing SSLs, EMRG, and HVP appropriate in
relation to remaining development challenges and projected improvements in
enemy ASCMs and ASBMs? To what degree are current schedules for
developing SSLs, EMRG, or HVP sensitive to annual funding levels?
 When does the Navy anticipate issuing roadmaps detailing its plans for procuring
and installing production versions of SSLs, EMRGs, and HVP on specific Navy
ships by specific dates?
 Will the kinds of surface ships that the Navy plans to procure in coming years
have sufficient space, weight, electrical power, and cooling capability to take full
advantage of SSLs (particularly those with beam powers above 200 kW) and
EMRG? What changes, if any, would need to be made in Navy plans for
procuring large surface combatants (i.e., destroyers and cruisers) or other Navy
ships to take full advantage of SSLs and EMRG?
 Are the funding sources for SSLs, EMRG, and HVP in Navy and Defense-Wide
research and development accounts sufficiently visible for supporting
congressional oversight?
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Navy Lasers, Railgun, and Hypervelocity Projectile: Background and Issues for Congress

Contents
Introduction ..................................................................................................................................... 1
Issue for Congress ..................................................................................................................... 1
Scope of Report ......................................................................................................................... 1
Background ..................................................................................................................................... 2
Strategic and Budgetary Context............................................................................................... 2
Concern about Survivability of Navy Surface Ships .......................................................... 2
Depth of Magazine and Cost Exchange Ratio .................................................................... 3
SSLs, EMRG, and HVP in Brief ............................................................................................... 4
SSLs .................................................................................................................................... 4
EMRG ............................................................................................................................... 13
HVP .................................................................................................................................. 16
Indirectly Improving Ability to Counter ASCMs and ASBMs ............................................... 22
Remaining Development Challenges ...................................................................................... 22
SSLs .................................................................................................................................. 23
EMRG and HVP ............................................................................................................... 24
Issues for Congress ........................................................................................................................ 26
Potential Oversight Questions ................................................................................................. 26
Legislative Activity for FY2017 .................................................................................................... 27
Summary of Congressional Action on FY2017 Funding ........................................................ 27
FY2017 National Defense Authorization Act (H.R. 4909/S. 2943) ........................................ 27
House ................................................................................................................................ 27
Senate ................................................................................................................................ 30
FY2017 DOD Appropriations Act (H.R. 5293/S. 3000) ......................................................... 33
House ................................................................................................................................ 33
Senate ................................................................................................................................ 34
Directed Energy Weapon Systems Acquisition Act of 2016 (H.R. 4964/S. 2778) .................. 34
House ................................................................................................................................ 34
Senate ................................................................................................................................ 36

Figures
Figure 1. Laser Weapon System (LaWS) on USS Ponce ................................................................ 7
Figure 2. Laser Weapon System (LaWS) on USS Ponce ................................................................ 7
Figure 3. Laser Weapon System (LaWS) on USS Ponce ................................................................ 8
Figure 4. Laser Weapon System Demonstrator (LWSD) on Self Defense Test Ship .................... 10
Figure 5. Laser Weapon System Demonstrator (LWSD) on Self Defense Test Ship ..................... 11
Figure 6. ONR Graphic of LWSD Components ............................................................................ 12
Figure 7. Industry-Built EMRG Prototype Demonstrator ............................................................. 14
Figure 8. Industry-Built EMRG Prototype Demonstrator ............................................................. 15
Figure 9. EMRG Prototype Demonstrator Installed on a JHSV .................................................... 16
Figure 10. Photograph Showing HVP ........................................................................................... 17
Figure 11. HVP .............................................................................................................................. 18
Figure 12. HVP Launch Packages ................................................................................................. 19
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Navy Lasers, Railgun, and Hypervelocity Projectile: Background and Issues for Congress

Figure 13. HVP Application to Various Launchers ....................................................................... 20
Figure 14. Navy Slide Depicting Operations Against Various Target Types ................................. 21
Figure 15. Development Challenges for SSLs .............................................................................. 24
Figure 16. Development Challenges for EMRG ........................................................................... 25

Tables
Table 1. Summary of Congressional Action on FY17 Funding..................................................... 27

Appendixes
Appendix. Potential Advantages and Limitations of Shipboard Lasers ........................................ 38

Contacts
Author Contact Information .......................................................................................................... 40

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Navy Lasers, Railgun, and Hypervelocity Projectile: Background and Issues for Congress

Introduction
Issue for Congress
This report provides background information and issues for Congress on three potential new
weapons that could improve the ability of Navy surface ships to defend themselves against enemy
missiles—solid state lasers (SSLs), the electromagnetic railgun (EMRG), and the hypervelocity
projectile (HVP).1
Any one of these new weapon technologies, if successfully developed and deployed, might be
regarded as a “game changer” for defending Navy surface ships against enemy missiles. If two or
three of them are successfully developed and deployed, the result might be considered not just a
game changer, but a revolution. Rarely has the Navy had so many potential new types of surface-
ship missile-defense weapons simultaneously available for development and potential
deployment. Although the Navy in recent years has made considerable progress in developing
SSLs, EMRG, and HVP, a number of significant development challenges remain.
The issue for Congress is whether to approve, reject, or modify the Navy’s funding requests and
proposed acquisition strategies for these three potential new weapons. Congress’ decisions on this
issue could affect future Navy capabilities and funding requirements and the defense industrial
base.
Scope of Report
SSLs are being developed by multiple parts of the Department of Defense (DOD), not just the
Navy. SSLs, EMRG, and HVP, moreover, have potential application to military aircraft and
ground forces equipment, not just surface ships. And SSLs, EMRG, and HVP can be used for
missions other than defending against ASCMs and ASBMs.2 This report focuses on Navy efforts
to develop SSLs, EMRG, and HVP for potential use in defending Navy surface ships against
ASCMs and ASBMs. It supersedes an earlier CRS report that provided an introduction to
potential Navy shipboard lasers.3
Note that while fictional depictions of laser weapons in popular media often show them being
used to attack targets at long ranges, the SSLs currently being developed by the Navy for
potential shipboard use would be used to counter targets at short ranges of about a mile to perhaps
a few miles.

1 Railgun is also spelled as rail gun; EMRG is also abbreviated as EM railgun; hypervelocity is also spelled as hyper-
velocity or hyper velocity.
2 As discussed later in the report, the Navy is exploring the potential for using shipboard lasers to counter small boats
and unmanned aerial vehicles (UAVs), and EMRG can be used to attack land targets.
3 CRS Report R41526, Navy Shipboard Lasers for Surface, Air, and Missile Defense: Background and Issues for
Congress
, by Ronald O'Rourke. This earlier CRS report has been archived and remains available as a supplementary
reference source on potential Navy shipboard lasers.
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Background
Strategic and Budgetary Context
Concern about Survivability of Navy Surface Ships
Although Navy surface ships have a number of means for defending themselves against anti-ship
cruise missiles (ASCMs) and anti-ship ballistic missiles (ASBMs),4 some observers are
concerned about the survivability of Navy surface ships in potential combat situations against
adversaries, such as China, that are armed with advanced ASCMs and with ASBMs.5 Concern
about this issue has led some observers to conclude that the Navy’s surface fleet in coming years
might need to avoid operating in waters that are within range of these weapons, or that the Navy
might need to move toward a different fleet architecture that relies less on larger surface ships and
more on smaller surface ships and submarines.6 Such changes in Navy operating areas and fleet
architecture could substantially affect U.S. military strategy and the composition of the Navy’s
shipbuilding expenditures.
Navy surface fleet leaders in early 2015 announced a new organizing concept for the Navy’s
surface fleet called distributed lethality. Under distributed lethality, offensive weapons such as
ASCMs are to be distributed more widely across all types of Navy surface ships, and new
operational concepts for Navy surface ship formations are to be implemented. The aim of
distributed lethality is to boost the surface fleet’s capability for attacking enemy ships and make it
less possible for an enemy to cripple the U.S. fleet by concentrating its attacks on a few very-
high-value Navy surface ships (particularly the Navy’s aircraft carriers).7 Perspectives on whether

4 These include the following: operating ships in ways that make it hard for others to detect and accurately track Navy
ships; jamming or destroying enemy targeting sensors; interfering with the transmission of targeting data from sensors
to weapon launchers; attacking weapon launchers (which can land-based launchers or launchers on surface ships,
submarines, or aircraft); and countering ASCMs and ASBMs headed toward Navy ships. Navy measures for countering
ASCMs and ASBMs headed toward Navy ships include the following: jamming a missile’s guidance system; using
decoys of various kinds to lure enemy missiles away from Navy ships; and shooting down enemy missiles with surface-
to-air missiles and the Phalanx Close-In Weapon System (CIWS), which is essentially a radar-controlled Gatling gun.
Employing all these measures reflects a long-standing Navy approach of creating a multi-layered defense against
enemy missiles, and of attacking the enemy’s “kill chain” at multiple points so as to increase the chances of breaking
the chain. (The kill chain is the sequence of steps that an enemy must complete to conduct a successful missile attack
on a Navy ship. This sequence includes, at a basic level of description, detecting and tracking the Navy ship, passing
that information from sensors to the weapon launcher, launching the weapon, and guiding the weapon all the way to the
Navy ship. Interfering with any one of these actions can break the kill chain and thereby prevent or defeat the attack.)
5 See, for example, Andrew F. Krepinevich, Maritime Warfare in a Mature Precision-Strike Regime, Washington,
Center for Strategic and Budgetary Assessments, 2014, 128 pp. For more on China’s ASCMs and ASBMs, see CRS
Report RL33153, China Naval Modernization: Implications for U.S. Navy Capabilities—Background and Issues for
Congress
, by Ronald O'Rourke.
ASCMs and ASBMs are not the only reasons that some observers are concerned about the future survivability of U.S.
Navy surface ships in combat situations; observers are also concerned about threats to U.S. Navy surface ships posed
by small boats, mines, and torpedoes.
6 See, for example, Phillip E. Pournelle, “The Deadly Future of Sea Control,” U.S. Naval Institute Proceedings, July
2015: 26-31.
7 See, for example, Thomas Rowden, Peter Gumataotao, and Peter Fanta, “Distributed Lethality,” U.S. Naval Institute
Proceedings
, January 2015: 18-23; Sam LaGrone, “SNA: Navy Surface Leaders Pitch More Lethal Ships, Surface
Action Groups,” USNI News, January 14, 2015; Kris Osborn, “Navy Unveils New Surface Warfare Strategy,”
Military.com, January 14, 2015; Sydney J. Freedberg Jr., “‘If It Floats, It Fights,’: Navy Seeks ‘Distributed Lethality,’”
Breaking Defense, January 14, 2015; Mike McCarthy and Megan Eckstein, “Navy Eyeing A ‘Hunter Killer’ Surface
(continued...)
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it would be cost effective to spend money spreading offensive weapons across a wider array of
Navy surface ships might be influenced by views on whether those surface ships can adequately
defend themselves against enemy missiles.
Depth of Magazine and Cost Exchange Ratio
Two key limitations that Navy surface ships currently have in defending themselves against
ASCMs and ASBMs are limited depth of magazine and unfavorable cost exchange ratios. Limited
depth of magazine refers to the fact that Navy surface ships can use surface-to-air missiles
(SAMs) and their Close-in Weapon System (CIWS) Gatling guns to shoot down only a certain
number of enemy unmanned aerial vehicles (UAVs) and anti-ship missiles before running out of
SAMs and CIWS ammunition8—a situation (sometimes called “going Winchester”), that can
require a ship to withdraw from battle, spend time travelling to a safe reloading location (which
can be hundreds of miles away),9 and then spend more time traveling back to the battle area.
Unfavorable cost exchange ratios refer to the fact that a SAM used to shoot down a UAV or anti-
ship missile can cost the Navy more (perhaps much more) to procure than it cost the adversary to
build or acquire the UAV or anti-ship missile. In the FY2016 defense budget, procurement costs
for Navy SAMs range from about $900,000 per missile to several million dollars per missile,
depending on the type.10
In combat scenarios against an adversary with a limited number of UAVs and anti-ship missiles,
an unfavorable cost exchange ratio can be acceptable because it saves the lives of Navy sailors
and prevents very expensive damage to Navy ships. But in combat scenarios (or an ongoing
military capabilities competition) against a country such as China that has many UAVs and anti-
ship missiles and a capacity for building or acquiring many more, an unfavorable cost exchange
ratio can become a very expensive—and potentially unaffordable—approach to defending Navy
surface ships against UAVs and anti-ship missiles, particularly in a context of constraints on U.S.
defense spending and competing demands for finite U.S. defense funds.

(...continued)
Fleet, Would Require Upgunning Existing Ship Fleets,” Defense Daily, January 15, 2015: 1-3; Richard Scott,
“Offensive Language: USN Sets Out Surface Firepower Strategy,” Jane’s International Defence Review, May 2015:
42-47; Megan Eckstein, “Navy Studying Implications of Distributed Lethality in Wargames Series,” USNI News, July
9, 2015; Lara Seligman, “Navy Establishes Task Force To Study Impact of Distributed lethality,” Inside the Navy, July
10, 2015.
8 Navy cruisers have 122 missile cells; Navy destroyers have 90 or 96 missile cells. Some of these cells are used for
storing and launching Tomahawk land attack cruise missiles or anti-submarine rockets. The remainder are available for
storing and launching SAMs. A Navy cruiser or destroyer might thus be armed with a few dozen or several dozen
SAMs for countering ASCMs and ASBMs. Countering ASCMs or ASBMs with SAMs might sometimes require
shooting two SAMs at each ASCM or ASBM.
9 The missile cells on a Navy cruiser or destroyers are clustered together in an installation called a Vertical Launch
System (VLS). VLS cells cannot be reloaded while the ship is underway; a ship needs to return to a port or a calm
anchorage to reload its VLS.
10 Unit procurement costs for ship-launched SAMs in the FY2016 are as follows: about $900,000 for the Rolling
Airframe Missile (RAM), about $1.1 million to about $1.5 million for the Evolved Sea Sparrow Missile (ESSM), about
$3.9 million for the SM-6 Block 1 missile, about $14 million for the SM-3 Block 1B missile, and more than $20
million for theSM-3 Block IIA missiles. RAM and ESSM are short-range missiles for defense against aircraft and
ASCMs. The SM-6 Block 1 is a medium-range missile used for both defense against aircraft and ASCMs, and terminal
(i.e., endo-atmospheric) defense against theater-range ballistic missiles. The SM-3 Block 1B and SM-3 Block IIA are
used for mid-course (i.e., exo-atmospheric) defense against theater-range ballistic missiles.
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SSLs, EMRG, and HVP offer a potential for dramatically improving depth of magazine and the
cost exchange ratio:
Depth of magazine. SSLs are electrically powered, drawing their power from
the ship’s overall electrical supply, and can be fired over and over, indefinitely, as
long as the SSL continues to work and the ship has fuel to generate electricity.
The EMRG’s projectile and the HVP (which are one and the same—see next
section) can be stored by the hundreds in a Navy surface ship’s weapon
magazine.11
Cost exchange ratio. An SSL can be fired for a marginal cost of less than one
dollar per shot (which is the cost of the fuel needed to generate the electricity
used in the shot), while the EMRG’s projectile/HVP has an estimated unit
procurement cost of about $25,000.12
For additional discussion of the strategic and budgetary context in which the programs discussed
in this report and other Navy programs may be considered, see CRS Report RL32665, Navy
Force Structure and Shipbuilding Plans: Background and Issues for Congress
, by Ronald
O'Rourke.
SSLs, EMRG, and HVP in Brief
SSLs
Overview
The Navy in recent years has leveraged both significant advancements in industrial SSLs and
decades of research and development work on military lasers done by other parts of DOD to
make substantial progress toward deploying high-energy SSLs13 on Navy surface ships. Navy
surface ships would use high-energy SSLs initially for countering small boats UAVs, and
potentially in the future for countering ASCMs and ASBMs as well.14 High-energy SSLs on Navy
ships would be short-range defensive weapons—they would counter targets at ranges of about
one mile to perhaps eventually a few miles.15

11 In July 2015, the Navy issued a request for information (RFI) to industry for the fabrication of a prototype EMRG
mount that would store a minimum of 650 rounds. (RFI for Fabrication of Prototype Mount for Naval Railgun,
Solicitation Number: N00024-15-R-4132, FedBizOpps.gov, July 29, 2015. See also Justin Doubleday, “Navy
Developing Integrated Mount For Electromagnetic Railgun,” Inside the Navy, July 31, 2015.)
12 Sources for cost of HVP: David Martin, “Navy’s Newest Weapon Kills at Seven Times the Speed of Sound,” CBS
News (cbssnews.com), April 7, 2014; Kris Osborn, “Navy Will Test its Electromagnetic Rail Gun aboard DDG 1000,”
DefenseTech, April 15, 2015.
13 In discussions of potential Navy shipboard lasers, a high-energy laser is generally considered to be a laser with a
beam power of at least 10 kilowatts (kW).
14 In general, lasers would counter small boats and missiles by heating and burning holes in their skins, and causing
thermal damage to their interiors. Lasers can also be used to “dazzle” (i.e., interfere with) electro-optical sensors on a
boat or missile.
15 The Navy has also performed research and development work on a different kind of laser, called the free electron
laser (FEL). In recent years, Navy research and development work on potential shipboard lasers has shifted more to
SSLs. For background information on the FEL, see CRS Report R41526, Navy Shipboard Lasers for Surface, Air, and
Missile Defense: Background and Issues for Congress
, by Ronald O'Rourke.
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In addition to a low marginal cost per shot and deep magazine, potential advantages of shipboard
lasers include fast engagement times, an ability to counter radically maneuvering missiles, an
ability to conduct precision engagements, and an ability to use lasers for graduated responses
ranging from detecting and monitoring targets to causing disabling damage. Potential limitations
of shipboard lasers relate to line of sight; atmospheric absorption, scattering, and turbulence
(which prevent shipboard lasers from being all-weather weapons); an effect known as thermal
blooming that can reduce laser effectiveness; countering saturation attacks; possible adversary
use of hardened targets and countermeasures; and risk of collateral damage, including damage to
aircraft and satellites and permanent damage to human eyesight, including blinding. These
potential advantages and limitations are discussed in greater detail in the Appendix.
Selected Key Developments
Key developments in the Navy’s high-energy SSL development effort include the following:
 Between 2009 and 2012, the Navy successfully tested a prototype SSL called the
Laser Weapon System (LaWS) against UAVs in a series of engagements that took
place initially on land and subsequently on a Navy ship at sea.
 Between 2010 and 2011, the Navy tested another prototype SSL called the
Maritime Laser Demonstration (MLD) in a series of tests that culminated with an
MLD installed on a Navy ship successfully engaging a small boat.
 In April 2013, the Navy announced that it planned to install LaWS on the USS
Ponce (pronounced pon-SAY)—a converted amphibious ship that is operating in
the Persian Gulf as an interim Afloat Forward Staging Base (AFSB[I])16—to
conduct evaluation of shipboard lasers in an operational setting against swarming
boats and swarming UAVs.17 The system was installed in August 2014 (see
Figure 1, Figure 2, and Figure 3).
 In March 2014, it was reported that the Navy anticipated moving to a shipboard
laser program of record in “the FY2018 time frame” and achieving an initial
operational capability (IOC) with a shipboard laser in FY2020 or FY2021.18

16 An AFSB operates as a “mother ship” for Navy helicopter and small boat operations. The Ponce is serving as an
interim AFSB pending the arrival of a new AFSB that is currently being built.
17 “Navy Leaders Announce Plans for Deploying Cost-Saving Laser Technology,” Navy News Service, April 8, 2013;
Thom Shanker, “Navy Deploying Laser Weapon Prototype Near Iran,” New York Times, April 9, 2013: 4; Mike
McCarthy, “Navy Deploying Laser For Taking Out Drones,” Defense Daily, April 9, 2013; Graham Warwick, “U.S.
Navy Planning Gulf Deployment For Laser Weapon,” Aerospace Daily & Defense Report, April 9, 2013: 6; Megan
Eckstein, “Navy-Built Laser Weapon System Will Begin Demo On Ponce In Early 2014,” Inside the Navy, April 15,
2013. See also Lara Seligman, “Navy-built LaWS To Begin Demo This Summer, IOC Slated For FY-20-21,” Inside
the Navy
, March 24, 2014; Office of Naval Research, “All Systems Go: Navy’s Laser Weapon Ready for Summer
Deployment,” Navy News Service, April 7, 2014.
Swarming refers to the use of boats and UAVs in large numbers, or swarms, in an attempt to confuse and overwhelm a
target ship’s defensive systems.
18 Lara Seligman, “Navy-built LaWS To Begin Demo This Summer, IOC Slated For FY-20-21,” Inside the Navy,
March 24, 2014. A program of record, or POR, is a term sometimes used by DOD officials that means, in general, a
program in the Future Years Defense Plan (FYDP) that is intended to provide a new, improved, or continuing materiel,
weapon, or information system or service capability in response to an approved need. The term is sometimes used to
refer to a program in a service’s budget for procuring and deploying an operational weapon system, as opposed to a
research and development effort that might or might not eventually lead to procurement and deployment of an
operational weapon system.
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 In December 2014, the Navy declared LaWS on the Ponce to be an “operational”
system.19
 In January 2016, the Navy stated that it anticipated releasing a directed energy
weapon roadmap in February 2016.20

19 A December, 11, 2014, press report stated
The Navy’s first-of-a-kind laser deployed on a vessel sailing in the Persian Gulf has been declared
operational and can be used by the crew to defend itself against potential threats, the service’s head
of the Office of Naval Research said on Wednesday [December 10, 2014].
Rear Adm. Matthew Klunder told reporters on a conference call that Central Command has been
green lighted to use the laser in the event of a threat, approval that has been passed along to the
ship’s commanding officer. The 30-kilowat laser, known as the Laser Weapon System, or LaWS,
was installed on the USS Ponce in August [2014].
The ship later departed for the Persian Gulf and the LaWS successfully carried out operational
testing recently by striking a fast attack boat and drone, Klunder said, adding that this marks the
“historic” first ever operational deployment of a directed energy weapon.
(Mike McCarthy, “Navy Authorized To Use Ship-Based Laser In Battle,” Defense Daily,
December 11, 2014: 3. See also Sam LaGrone, “U.S. Navy Allowed to Use Persian Gulf Laser for
Defense,” USNI News, December 10, 2014; Philip Ewing, “Navy Declares Laser Weapon
‘Operational,’” Politico Pro (Pro Defense Report), December 10, 2014.)
The Navy testified on February 24, 2016, that
the Solid State Laser Quick Reaction Capability (SSL-QRC) was fielded as a science and
technology demonstration aboard the USS PONCE. It was successfully demonstrated as an
effective weapon system and was subsequently transitioned to the fleet in the Central Command
area of responsibility and is now an operational system.
(Statement of Rear Admiral Mathias W. Winter, United States Navy, Chief of Naval Research,
Before the Emerging Threats and Capabilities Subcommittee of the House Armed Services
Committee on The Fiscal Year 2017 Budget Request, February 24, 2016, p. 15.)
20 Justin Doubleday, “Winter: Navy Directed-Energy Strategy To Be Released This Month,” Inside the Navy, February
1, 2016.
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Figure 1. Laser Weapon System (LaWS) on USS Ponce

Source: Navy photograph dated November 16, 2014, accompanying David Smalley, “Historic Leap: Navy
Shipboard Laser Operates in Arabian Gulf,” Navy News Service, December 10, 2014, accessed August 12, 2015, at
http://www.navy.mil/list_al .asp?id=84805.
Figure 2. Laser Weapon System (LaWS) on USS Ponce

Source: Navy photograph dated November 17, 2014, accompanying David Smalley, “Historic Leap: Navy
Shipboard Laser Operates in Arabian Gulf,” Navy News Service, December 10, 2014, accessed August 12, 2015, at
http://www.navy.mil/list_al .asp?id=84805.
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Figure 3. Laser Weapon System (LaWS) on USS Ponce

Source: Navy photograph dated November 16, 2014, accompanying David Smalley, “Historic Leap: Navy
Shipboard Laser Operates in Arabian Gulf,” Navy News Service, December 10, 2014, accessed August 12, 2015, at
http://www.navy.mil/list_al .asp?id=84805.
SSL Technology Maturation (SSL-TM) Program
LaWS has a reported beam power of 30 kilowatts (kW),21 which is strong enough to counter
small boats and UAVs. As a follow-on effort to LaWS and MLD, the Navy initiated the SSL
Technology Maturation (SSL-TM) program, in which industry teams led by BAE Systems,
Northrop Grumman, and Raytheon, among others, competed to develop a shipboard laser with a
beam power of 100 kW to 150 kW, which would provide increased effectiveness against small

21 See, for example, Mike McCarthy, “Navy Authorized To Use Ship-Based Laser In Battle,” Defense Daily, December
11, 2014: 3.
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boats and UAVs.22 Boosting beam power further—to something like 200 kW or 300 kW—could
permit a laser to counter at least some ASCMs. Even stronger beam powers—on the order of at
least several hundred kW, if not one megawatt (MW) or more—could improve a laser’s
effectiveness against ASCMs and enable it to counter ASBMs.23
On October 22, 2015, DOD announced that it had selected Northrop Grumman as the winner of
the SSL-TM competition. DOD’s contract-award announcement stated:
Northrop Grumman Space and Mission Systems Corp., Redondo Beach, California, is
being awarded a $53,151,809 cost-plus-fixed-fee contract for the Solid State High Power
Laser Weapon System Demonstrator (LWSD) program.... The Office of Naval Research
seeks to continue the advancement of SSL weapon system designs, architectures, and
component technologies. The government believes that improvements in lethality may be
achieved through maturation and optimization of a variety of system characteristics,
including laser power, beam quality, beam director architecture, and other physical and
optical aspects of the laser, beam director, and system design. Leveraging our experience
and internal investments, the Northrop Grumman team is ready to fully support the three
phases of the LWSD program. This contract contains options, which if exercised, will
bring the contract value to $91,057,597. Work will be performed in Redondo Beach,
California, and is expected to be completed Oct. 21, 2016. If options are exercised, work
will continue through July 7, 2018.... This contract was competitively procured under the
Office of Naval Research broad agency announcement 15-0005 entitled “Solid State,
High Power Laser Weapon System Demonstrator (LWSD) Design, Development and
Demonstration for Surface Navy, USN.” Six proposals were received in response to this
solicitation.24
A December 22, 2016, Northrop Grumman news release about the October 22, 2016, contract
award stated:
During Phase 1 of the LWSD contract, Northrop Grumman will develop a detailed design
for the new system. Phase 2 will include assembly and ground test of the system, while
Phase 3 will comprise at-sea testing of the system aboard the Navy's Self Defense Test
Ship (SDTS). The Navy will lead this testing with Northrop Grumman providing
technical support. The SDTS is the former USS Paul F. Foster (DD-964).
According to Renard, Northrop Grumman's LWSD is well suited to support the Navy's
planned initial testing on the SDTS. The company has designed its system to be installed,
however, with minimal modification or additional costs, for demonstration on the Navy's
DDG-51 FLT II class destroyers.25

22 For more on the SSL-TM program, see Office of Naval Research, “Solid-State Laser Technology Maturation
Program,” accessed August 11, 2015, at http://www.onr.navy.mil/Media-Center/Fact-Sheets/Solid-State-Laser-
Technology-Maturation-Program.aspx; Office of Naval Research, “Solid State Laser Technology Maturation
Program,” September 2012, accessed August 11, 2015, at http://www.onr.navy.mil/~/media/Files/Fact-Sheets/35/Solid-
State-Laser-Technology-Maturation-Program-2012-a.ashx; Office of Naval Research, “Research and
Development/Technology Maturation of Solid State High Power Laser Weapon Systems, Subsystems, and/or
Components for Surface Navy, USN, Broad Agency Announcement (BAA),” ONR BAA # 12-019, 2012, accessed
August 11, 2015, at http://www.onr.navy.mil/~/media/files/funding-announcements/baa/2012/12-019.ashx; Future
Force, “Developing a High-Energy Laser for the Navy,” January 23, 2015, accessed August 11, 2015, at
http://futureforce.navylive.dodlive.mil/2015/01/high-energy-laser/.
23 For additional discussion, see CRS Report R41526, Navy Shipboard Lasers for Surface, Air, and Missile Defense:
Background and Issues for Congress
, by Ronald O'Rourke, particularly the section entitled “Required Laser Power
Levels for Countering Targets” and Appendix A on “Laser Power Levels Required to Counter Targets.”
24 DOD contract award announcements for October 22, 2015, accessed December 18, 2015, at:
http://www.defense.gov/News/Contracts/Contract-View/Article/625630.
25 “US Navy Selects Northrop Grumman to Design and Produce Shipboard Laser Weapon System Demonstrator,”
(continued...)
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Figure 4 shows an artist’s rendering of LWSD installed on the Navy’s Self Defense Test Ship (the
USS Paul F. Foster [DD-964], an old Spruance [DD-963] class destroyer).
Figure 4. Laser Weapon System Demonstrator (LWSD) on Self Defense Test Ship
Artist’s rendering

Source: Cropped version of image accessed on March 18, 2016, at
http://media.globenewswire.com/cache/189/hires/39412.jpg.
Figure 5 is a detail from the above photo.

(...continued)
December 22, 2016, accessed March 18, 2016, at:
http://www.globenewswire.com/newsarchive/noc/press/pages/news_releases.html?d=10158731. See also Richard
Scott, “Northrop Grumman To Build on MLD for SSL Demonstrator,” IHS Jane’s International Defence Review,
February 2016: 5.
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Figure 5. Laser Weapon System Demonstrator (LWSD) on Self Defense Test Ship
Artist’s rendering

Source: Cropped version of image accessed on March 18, 2016, at
http://media.globenewswire.com/cache/189/hires/39412.jpg.
Figure 6 Is an Office of Naval Research (ONR) graphic illustration of the LWSD’s major
components.
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Figure 6. ONR Graphic of LWSD Components
Artist’s rendering

Source: Slide from February 2016 ONR briefing to CRS on SSL-TM program, received from Navy Office of
Legislative Affairs February 26, 2016.
Directed Energy Roadmap
A July 28, 2015, press report stated:
[Secretary of the Navy Ray] Mabus said he would release a DE [directed energy]26
roadmap this fall that “charts our course for research, development, and fielding of high
power radio frequency weapons, lasers, and directed energy countermeasures. And I will
follow it up with my guidance to the Program Objective Memorandum for [Fiscal Year
2018],27 which, importantly, establishes a resource sponsor and a program of record.”...
Also meant to help quicken the pace of progress, the Office of Naval Research will take
lessons learned from the [USS] Ponce to inform the Solid State Laser Technology
Maturation program that aims to produce a 100-150 kilowatt laser prototype for at-sea
testing in 2018, or sooner if possible. Rear Adm. Bryant Fuller, Naval Sea Systems
Command (NAVSEA) chief engineer, said... that everything the Navy learned about rules

26 Lasers and another class of weapons called high-power microwave (HPM) weapons are referred to collectively as
directed-energy weapons because they achieve their effects by directing electromagnetic energy at their targets.
27 The Program Objective Memorandum (POM) is an internal DOD document that guides the preparation of a budget
for a particular fiscal year.
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of engagement and how to use LaWS in an operational environment would apply to
larger laser weapons as well. Leveraging the operational knowledge Ponce gained will
help the Navy field whatever comes out of the SSL-TM effort much more rapidly.
In the meantime, Mabus said the Laser Weapon System (LaWS) will continue its work in
the Middle East after early success led officials to extend its deployment.28
EMRG
In addition to SSLs, the Navy since 2005 has been developing EMRG, a cannon that uses
electricity rather than chemical propellants (i.e., gunpowder charges) to fire a projectile.29 In
EMRG, “magnetic fields created by high electrical currents accelerate a sliding metal conductor,
or armature, between two rails to launch projectiles at [speeds of] 4,500 mph to 5,600 mph,”30 or
roughly Mach 5.9 to Mach 7.4 at sea level.31 Like SSLs, EMRG draws its power from the ship’s
overall electrical supply.32 The Navy originally began developing EMRG as a naval surface fire
support (NSFS) weapon for supporting U.S. Marines operating ashore, but subsequently
determined that the weapon also has potential for defending against ASCMs and ASBMs.33 In
response to Section 243 of the FY2012 National Defense Authorization Act (H.R. 1540/P.L. 112-
81 of December 31, 2011), the Navy in September 2012 submitted to the congressional defense
committees a report on the EMRG development effort.34
Following tests with early Navy-built EMRG prototypes, the Navy funded the development of
two industry-built EMRG prototype demonstrators, one by BAE Systems and the other by
General Atomics (see Figure 7 and Figure 8).

28 Megan Eckstein, “Mabus: Adversaries Showing Interest in Directed Energy; Navy Needs to Move Faster,” USNI
News
, July 28, 2015.
29 Because it uses electricity rather than a powder charge to accelerate the projectile, Navy officials sometimes refer to
EMRG as a launcher rather than a gun or cannon.
30 Grace Jean, “With a Bang, Navy Begins Tests on EM Railgun Prototype Launcher,” Navy News Service, February
28, 2012, accessed August 12, 2015, at http://www.navy.mil/submit/display.asp?story_id=65577.
31 The speed of sound in air (i.e., Mach 1), varies with altitude; at sea level, it is approximately 761 miles an hour. (See
for example, the table entitled “Speed of Sound at Different Altitudes,” accessed August 12, 2015, at
http://www.fighter-planes.com/jetmach1.htm.
32 Unlike SSLs, however, EMRG is not a directed energy weapon, because it achieves its effects by firing a physical
projectile at the target, not by directing electromagnetic energy at the target. See also footnote 26.
33 For a recent article discussing the use of EMRG in countering ASCMs and ASBMs, see Sam LaGrone, “Navy Wants
Rail Guns to Fight Ballistic and Supersonic Missiles Says RFI,” USNI News, January 5, 2015.
34 U.S. Navy, Electromagnetic Railgun System: Final Report to the Congressional Defense Committees, August 2012,
with cover letters dated September 18, 2012. For a press report discussing the Navy’s report to Congress, see Dan
Taylor, “Stackley: Navy Identifies Four Technical Hurdles To Railgun Development,” Inside the Navy, November 19,
2012.
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Figure 7. Industry-Built EMRG Prototype Demonstrator
BAE prototype

Source: Navy photograph dated July 8, 2014, associated with Office of Naval Research Public Affairs, “From
Research to Railgun: Revolutionary Weapon at Future Force EXPO,” Navy News Service, January 13, 2015,
accessed August 12, 2015, at http://www.navy.mil/submit/display.asp?story_id=85166.


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Figure 8. Industry-Built EMRG Prototype Demonstrator
General Atomics prototype

Source: navy photograph dated July 8, 2014, accessed August 12, 2015, at
http://www.navy.mil/view_image.asp?id=180994.
The two industry-built prototypes are designed to fire projectiles at energy levels of 20 to 32
megajoules,35 which is enough to propel a projectile 50 to 100 nautical miles.36 (Such ranges
might refer to using the EMRG for NSFS missions. Intercepts of ASCMs and ASBMs might take
place at much shorter ranges.) The Navy began evaluating the two industry-built prototypes in
2012.
In April 2014, the Navy announced that it plans to temporarily install a prototype EMRG aboard a
Navy Joint High Speed Vessel (JHSV) in FY2016, for use in at-sea tests.37 Figure 9 is an artist’s
rendering of that installation.
In January 2015, it was reported that the Navy is projecting that EMRG could become operational
on a Navy ship between 2020 and 2025.38 In April 2015, it was reported that the Navy is
considering installing an EMRG on a Zumwalt (DDG-1000) class destroyer by the mid-2020s.39

35 The Navy states that “a megajoule is a measurement of energy associated with a mass traveling at a certain velocity.
In simple terms, a one-ton vehicle moving at 100 mph equals a magajoule of energy.” (Office of Naval Research Public
Affairs, “Navy Sets New World Record with Electromagnetic Railgun Demonstration,” Navy News Service, December
10, 2010, accessed August 12, 2015, at http://www.navy.mil/submit/display.asp?story_id=57690.)
36 Grace Jean, “With a Bang, Navy Begins Tests on EM Railgun Prototype Launcher,” Navy News Service, February
28, 2012, accessed August 12, 2015, at http://www.navy.mil/submit/display.asp?story_id=65577.
37 Naval Sea Systems Command Office of Corporate Communication, “Navy to Deploy Electromagnetic Railgun
Aboard JHSV,” Navy News Service, April 7, 2014, accessed August 12, 2015, at
http://www.navy.mil/submit/display.asp?story_id=80055.
38 Sam LaGrone, “Navy Wants Rail Guns to Fight Ballistic and Supersonic Missiles Says RFI,” USNI News, January 5,
2015.
39 Sam LaGrone, “Navy Considering Railgun for Third Zumwalt Destroyer,” USNI News, February 5, 2015 (updated
(continued...)
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Figure 9. EMRG Prototype Demonstrator Installed on a JHSV
Artist’s rendering

Source: Briefing slide entitled “FY16 At-Sea Test of Railgun” in Navy briefing entitled “Railgun Program
Overview,” undated but posted at InsideDefense.com on April 14, 2015. (InsideDefense.com states that the
briefing was presented at a public conference on April 14, 2015.)
HVP
As the Navy was developing EMRG, it realized that the guided projectile being developed for
EMRG could also be fired from 5-inch and 155mm powder guns.40 Navy cruisers each have two

(...continued)
February 11, 2015); Mike McCarthy, “Navy Aiming To Put Railgun On Third Zumwalt Destroyer,” Defense Daily,
February 6, 2015; Kris Osborn, “Navy Will Test its Electromagnetic Rail Gun aboard DDG 1000,” DefenseTech, April
15, 2015. For more on Zumwalt-class destroyers, see CRS Report RL32109, Navy DDG-51 and DDG-1000 Destroyer
Programs: Background and Issues for Congress
, by Ronald O'Rourke.
40 The Navy describes the HVP as “a next generation, common, low drag, guided projectile capable of completing
multiple missions for gun systems such as the Navy 5-Inch, 155-mm, and future railguns.... HVP’s low drag
aerodynamic design enables high velocity, maneuverability, and decreased time-to-target. These attributes coupled with
accurate guidance electronics provide low cost mission effectiveness against current threats and the ability to adapt to
air and surface threats of the future.” (Office of Naval Research, Hypervelocity Projectile,” September 2012, accessed
August 14, 2015, at http://www.onr.navy.mil/~/media/Files/Fact-Sheets/35/Hypervelocity-Projectile-2012B.ashx.) The
Navy states that HVP weighs 23 pounds. (Source: David Martin, “Navy’s Newest Weapon Kills at Seven Times the
Speed of Sound,” CBS News (cbssnews.com), April 7, 2014.)
BAE Systems states that HVP is 24 inches long and weighs 28 pounds, including a 15-pound payload. The total length
and weight of an HVP launch package, BAE Systems states, is 26 inches and 40 pounds. BAE states that the maximum
rate of fire for HVP is 20 rounds per minute from a Mk 45 5-inch gun, 10 rounds per minute from the 155mm gun on
DDG-1000 class destroyers (called the Advanced Gun System, or AGS), and 6 rounds per minute from EMRG. HVP’s
firing range, BAE Systems states, is more than 40 nautical miles (when fired from a Mk 45 Mod 2 5-inch gun), more
than 50 nautical miles (Mk 45 Mod 4 5-inch gun), more than 70 nautical miles (155mm gun on DDG-1000 class
destroyers), and more than 100 nautical miles (EMRG). (BAE Systems, “Hypervelocity Projectile (HVP),” 2014,
(continued...)
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5-inch guns, and most Navy destroyers each have one 5-inch gun. The Navy’s three new Zumwalt
class (DDG-1000) destroyers, which are under construction, each have two 155mm guns.
The projectile is a hypervelocity projectile when fired from either EMRG or a powder gun, but
the term HVP tends to be used more frequently in connection with the concept of firing it from a
powder gun. Figure 10 and Figure 11 show the HVP.
Figure 10. Photograph Showing HVP

Source: Navy photograph dated April 4, 2014, with a caption that reads: “Rear Adm. Matthew Klunder, chief of
naval research, shows off a Hypervelocity Projectile (HVP) to CBS News reporter David Martin during an
interview held at the Naval Research Laboratory's materials testing facility. The HVP is a next-generation,
common, low drag, guided projectile capable of completing multiple missions for gun systems such as the Navy
5-inch, 155-mm, and future railguns,” accessed August 12, 2015, at
http://www.navy.mil/view_image.asp?id=174517.

(...continued)
accessed August 14, 2015, at http://www.baesystems.com/download/BAES_178505/hyper-velocity-projectile-hvp-
datasheet.)
In July 2015, the Navy issued a request for information (RFI) to industry for the fabrication of a prototype EMRG
mount capable of handling an integrated launch weight package of 22 kg, or about 48.5 pounds. (RFI for Fabrication of
Prototype Mount for Naval Railgun, Solicitation Number: N00024-15-R-4132, FedBizOpps.gov, July 29, 2015. See
also Justin Doubleday, “Navy Developing Integrated Mount For Electromagnetic Railgun,” Inside the Navy, July 31,
2015.)
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Figure 11. HVP

Source: Slide 7 from Navy briefing entitled “Electromagnetic Railgun,” NDIA Joint Armaments Forum,
Exhibition & Technology Demonstration, May 14, 2014, LCDR Jason Fox, USN, Assistant PM [Program
Manager], Railgun Ship Integration, Distribution A, Approved for Public Release, accessed August 13, 2015, at
http://www.dtic.mil/ndia/2014armaments/WedFox.pdf.
When fired from 5-inch powder guns, the projectile achieves a speed of roughly Mach 3, which is
roughly half the speed it achieves when fired from EMRG, but more than twice the speed of a
conventional 5-inch shell fired from a 5-inch gun.41 This is apparently fast enough for countering
at least some ASCMs. The Navy states that “The HVP—combined with the MK 45 [5-inch
gun]42—will support various mission areas including naval surface fire support, and has the
capacity to expand to a variety of anti-air threats, [and] anti-surface [missions], and could expand
the Navy's engagement options against current and emerging threats.”43
One advantage of the HVP/5-inch gun concept is that the 5-inch guns are already installed on
Navy cruisers and destroyers, creating a potential for rapidly proliferating HVP through the
cruiser-destroyer force, once development of HVP is complete and the weapon has been

41 Source: Sam LaGrone, “Updated: Navy Researching Firing Mach 3 Guided Round from Standard Deck Guns,” USNI
News
, June 1, 2015 (updated June 2, 2015).
42 The type of 5-inch gun on Navy cruisers and destroyers is called the Mark 45.
43 Naval Surface Warfare Center Dahlgren Division Corporate Communications, “DEPSECDEF Loads HVP on Test
Range, Observes Repetitive Rate Electromagnetic Railgun's Commissioning Series,” Navy News Service, May 8, 2015,
accessed August 12, 2015, at http://www.navy.mil/submit/display.asp?story_id=86987.
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integrated into cruiser and destroyer combat systems. Figure 12 shows HVP launch packages
configured for 5-inch guns, 155mm guns, and EMRG.
Figure 12. HVP Launch Packages
Launch packages for 5-inch gun, 155mm gun, and EMRG

Source: BAE Systems, “Hypervelocity Projectile (HVP),” 2014, accessed August 14, 2015, at
http://www.baesystems.com/download/BAES_178505/hyper-velocity-projectile--datasheet.
Figure 13 is a slide showing the potential application of HVP to 5-inch power guns, 155mm
powder guns, and EMRG. The first line of the slide, for example, discusses HVP’s use with 5-
inch powder guns, stating that it uses a high-explosive (HE) warhead for the NSFS mission;44 that
a total of 113 5-inch gun barrels are available in the fleet (which could be a reference to 22
cruisers with two guns each, and 69 destroyers with one gun each); and that as a game-changing
capability, it is guided and can be used at ranges of up to 26 nautical miles to 41 nautical miles for
NSFS operations, for countering ASCMs, and for anti-surface warfare (ASuW) operations (i.e.,
attacking surface ships and craft).

44 The “KE” in the next line down means that when fired from EMRG, the projectile can alternatively attack targets
using its own kinetic energy (i.e., by simply impacting the target at hypersonic speed).
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Figure 13. HVP Application to Various Launchers

Source: Slide 16 from Navy briefing entitled “Electromagnetic Railgun,” NDIA Joint Armaments Forum,
Exhibition & Technology Demonstration, May 14, 2014, LCDR Jason Fox, USN, Assistant PM [Program
Manager], Railgun Ship Integration, Distribution A, Approved for Public Release, accessed August 13, 2015, at
http://www.dtic.mil/ndia/2014armaments/WedFox.pdf.
Figure 14 is a not-to-scale illustration of how HVPs fired from EMRGs and 5-inch guns can be
used to counter various targets, including ASCMs and ASBMs.
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Figure 14. Navy Slide Depicting Operations Against Various Target Types

Source: Slide 5 from Navy briefing entitled “Electromagnetic Railgun,” NDIA Joint Armaments Forum,
Exhibition & Technology Demonstration, May 14, 2014, LCDR Jason Fox, USN, Assistant PM [Program
Manager], Railgun Ship Integration, Distribution A, Approved for Public Release, accessed August 13, 2015, at
http://www.dtic.mil/ndia/2014armaments/WedFox.pdf.
An April 11, 2016, press report states:
The Pentagon wants to take a weapon originally designed for offense, flip its punch for
defense and demonstrate by 2018 the potential for the Army and Navy to conduct missile
defense of bases, ports and ships using traditional field guns to fire a new hypervelocity
round guided by a mobile, ground variant of an Air Force fighter aircraft radar.
The Strategic Capabilities Office is working with the Army, Navy and Air Force to craft
a Hypervelocity Gun Weapon System that aims, in part, to provide China and Russia an
example of a secret collection of new U.S. military capabilities the Defense Department
is bringing online in an effort to strengthen conventional deterrence.
"It is a fantastic program," Will Roper, Strategic Capabilities Office director, said in a
March 28 interview with reporters, who said the project aims "to completely lower the
cost of doing missile defense" by defeating missile raids at a lower cost per round and, as
a consequence, imposing higher costs on attackers.45
A May 5, 2016, press report states:

45 Jason Sherman, “SCO Aims To Flip The Script on Missile Defense With Hypervelocity Gun,” Inside the Navy, April
11, 2016.
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Come January [2017], the Pentagon will almost assuredly have new leadership, complete
with a new vision for how the Department of Defense should operate, organize and plan
for the future.
It’s a reality facing down Defense Secretary Ash Carter and Deputy Secretary Bob Work
as they try to complete a transformation at the Pentagon, one which both men have said is
vital to making sure the US is able to maintain its technological edge against great
powers like Russia and China in the future.
While Carter has made his reach-out to nontraditional communities the centerpiece of his
initiative, Work’s focus has been the “Third Offset,” a series of technological bets,
largely focused on man-unmanned teaming, that he believes will pay off in the future.
So how do you make sure that a long-term project like the Third Offset keeps going
under a new administration?
“We have three really complimentary ways to go about this,” Work said Monday at an
event hosted by the Atlantic Council.
The first, he explained, is giving many options to the next administration.
“First of all, I’m going to be central to the transition, so I am going to be able to
personally talk with the transition team and explain to them what we have pursued and
why we have pursued it, and let them make their own decisions,” Work said.
“One of the things we have done in our program is build in a lot of different options that
they can pull levers on,” Work explained.
As an example, he pointed to the idea of an electromagnetic railgun. Initially, Work and
his team thought that was an area that would be a major focus of development, but as
they experimented they realized that a powder gun with a hypervelocity round could have
almost the same impact — but at a fraction of the cost, because it did not require the
development, testing and adaptation of a new gun.
“We’re going to say ‘look, this is the place where [we think] you want to put your
money,’ but we’re going to have enough money in both the electromagnetic railgun and
the powder gun that if the new administration says ‘I really want the electromagnetic
railgun, this is the way I want to go,’ knock yourself out,” Work said. “We’ve set you up
for success.”46
Indirectly Improving Ability to Counter ASCMs and ASBMs
As discussed earlier, SSLs currently under development have enough beam power to counter
small boats and UAVs, but not enough to ASCMs or ASBMs. Even so, such SSLs could
indirectly improve a ship’s ability to counter ASCMs and ASBMs by permitting the ship to use
fewer of its SAMs for countering UAVs, and more of them for countering ASCMs and ASBMs.
Similarly, even though HVPs fired from 5-inch powder guns would not be able to counter
ASBMs, they could indirectly improve a ship’s ability to counter ASBMs by permitting the ship
to use fewer of its SAMs for countering ASCMs and more of its SAMs for countering ASBMs.
Remaining Development Challenges
Although the Navy in recent years has made considerable progress in developing SSLs, EMRG,
and HVP, a number of significant development challenges remain. Overcoming these challenges

46 Aaron Mehta, “Pentagon No. 2: How to Keep Third Offset Going in the Next Administration,” Defense News, May
5, 2016.
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will likely require years of additional development work, and ultimate success in overcoming
them is not guaranteed.47
SSLs
As shown in Figure 15, remaining development challenges for SSLs include, among other things,
making the system rugged enough for extended shipboard use, making the beam director (the
telescope-like part of the laser that sends the beam toward the target) suitable for use in a marine
environment (where moisture and salt in the air can be harsh on equipment), and integrating the
system into the ship’s electrical power system and combat system.
A January 23, 2015, blog post co-authored by the Office of Naval Research’s program officer for
the Navy’s SSL program states:
In the near term, many challenges remain to develop and operate high-energy laser
systems in the maritime environment that are unique to the Navy and Marine Corps.
Among these challenges is dealing with the heat generated as power levels increase. A
second issue is packing sufficient power on the platform, which will require advanced
battery, generator, power conditioning, and hybrid energy technologies. Current laser
technologies are approximately 30 percent electrically efficient. Corrosion and
contamination of optical windows by shipboard salt spray, dirt, and grime also are
technical challenges. In addition, atmospheric turbulence resulting from shifting weather
conditions, moisture, and dust is problematic. Turbulence can cause the air over long
distances to act like a lens, resulting in the laser beam’s diffusing and distorting, which
degrades its performance.
Much progress has been made in demonstrating high-energy laser weapon systems in the
maritime environment, but there is still much to be done. Additional advances will be
required to scale power levels to the hundreds of kilowatts that will make high[-]energy
lasers systems robust, reliable, and affordable. Higher power levels are important for the
ability to engage more challenging threats and improve the rate and range at which
targets can be engaged.
The programs managed by ONR are addressing these remaining issues while positioning
this important warfighting capability toward an acquisition program and eventual
deployment with the fleet and force.48

47 Laser skeptics sometimes note that laser proponents over the years have made numerous predictions about when
lasers might enter service with DOD, and that these predictions repeatedly have not come to pass. Viewing this record
of unfulfilled predictions, skeptics might argue that “lasers are X years in the future—and always will be.” Laser
proponents acknowledge the record of past unfulfilled predictions, but argue that the situation has now changed
because of rapid advancements in SSL technology and a shift from earlier ambitious goals (such as developing
megawatt-power lasers for countering targets at tens or hundreds of miles) to more realistic goals (such as developing
kilowatt-power lasers for countering targets at no more than a few miles). Laser proponents might argue that laser
skeptics are vulnerable to what might be called cold plate syndrome (i.e., a cat that sits on a hot plate will not sit on a
hot plate again—but it will not sit on a cold plate, either).
48 Peter Morrison and Dennis Sorenson, “Developing a High-Energy Laser for the Navy,” Future Force, January 23,
2015, accessed August 13, 2015, at http://futureforce.navylive.dodlive.mil/2015/01/high-energy-laser/. The authors are
identified at the end of the post as follows: “Peter Morrison is the Office of Naval Research’s program officer for the
Navy’s Solid-State Laser program. Dennis Sorenson is a contractor with the Office of Naval Research.”
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Figure 15. Development Challenges for SSLs
As of February 2013

Source: Slide from Navy briefing entitled “Navy Solid State Laser Program Overview,” ASNE Day 2013, Mr.
Peter “Rol ie” Morrison, ONR 35 S&T Program Office, February 22, 2013, accessed August 13, 2015, at
https://www.navalengineers.org/ProceedingsDocs/ASNEDay2013/Morrison_Pres.pdf.
EMRG and HVP
As shown in Figure 16, remaining development challenges for EMRG involve items relating to
the gun itself (including increasing barrel life to desired levels), the projectile, the weapon’s
electrical power system, and the weapon’s integration with the ship. Fielding HVP on cruisers and
destroyers ships equipped with 5-inch and 155mm powder guns would additionally require HVP
to be integrated with the combat systems of those ships.
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Figure 16. Development Challenges for EMRG
As of May 2014

Source: Slide 9 from Navy briefing entitled “Electromagnetic Railgun,” NDIA Joint Armaments Forum,
Exhibition & Technology Demonstration, May 14, 2014, LCDR Jason Fox, USN, Assistant PM [Program
Manager], Railgun Ship Integration, Distribution A, Approved for Public Release, accessed August 13, 2015, at
http://www.dtic.mil/ndia/2014armaments/WedFox.pdf.
The Navy states:
The EMRG effort began in FY 2005 with a focus on the barrel, power storage, and rail
technology. In 2015, the Navy is testing full-scale industry advanced composite launchers
for structure strength and manufacturability, and has advanced the pulsed-power system
design from single-shot to actively cooled repeated rate operations. Building on the
success of the first phase, the second phase started in 2012 with a focus on developing
equipment and techniques to fire ten rounds per minute. Thermal-management techniques
required for sustained firing rates are in development for both the launcher system and
the pulsed-power system. The Office of Naval Research will develop a tactical prototype
EMRG launcher and pulsed-power architecture suitable for advanced testing both afloat
and ashore. Railgun demonstration has been funded to occur in FY 2016.49
A June 2015 press report states:
As the Navy prepares to test its electromagnetic railgun at sea for the first time in 2016,
service leaders said one of the biggest challenges will be integrating the new technology
onto existing platforms.....

49 U.S. Navy, U.S. Navy Program Guide 2015, p. 169.
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[Vice Adm. William Hilarides, commander of Naval Sea Systems Command] said he is
positive the Navy will successfully demonstrate the weapon’s ability to fire from the
Trenton, but one of the biggest challenges will be configuring the railgun so that it fits
within the power structure of other existing platforms.
“Those are not 600-ton margin ships,” he said [meaning ships with 600 tons of growth
margin available to accommodate EMRG]. “If they have 60 tons, if they have 16 tons,
then we’ll be talking about what do we take off our existing destroyers, cruisers and other
ships in order to get this incredible capability [on them].”
These types of discussions are influencing ship designs as program managers look at
what systems are indispensable and what can be exchanged, Hilarides said.
Integrating the railgun into the fleet won’t be a swift process.
It will be at least 10 years until the railgun is fielded on new ships and potentially 30
years past that before the Navy considers removing powder guns from the fleet entirely
and transitioning to energy weapons alone, according to Hilarides.50
Issues for Congress
Potential Oversight Questions
Potential oversight questions for Congress regarding Navy programs for SSLs, EMRG, and HVP
include the following:
 Using currently available approaches for countering ASCMs and ASBMs, how
well could Navy surface ships defend themselves in a combat scenario against an
adversary such as China that has large numbers of ASCMs (including advanced
models) and ASBMs? How would this change if Navy surface ships in coming
years were equipped with SSLs, EMRG, HVP, or some combination of these
systems?
 How significant are the remaining development challenges for SSLs, EMRG, and
HVP?
 Are current schedules for developing SSLs, EMRG, and HVP appropriate in
relation to remaining development challenges and projected improvements in
enemy ASCMs and ASBMs? To what degree are current schedules for
developing SSLs, EMRG, or HVP sensitive to annual funding levels?
 When does the Navy anticipate issuing roadmaps detailing its plans for procuring
and installing production versions of SSLs, EMRGs, and HVP on specific Navy
ships by specific dates?
 Will the kinds of surface ships that the Navy plans to procure in coming years
have sufficient space, weight, electrical power, and cooling capability to take full
advantage of SSLs (particularly those with beam powers above 200 kW) and
EMRG? What changes, if any, would need to be made in Navy plans for
procuring large surface combatants (i.e., destroyers and cruisers) or other Navy
ships to take full advantage of SSLs and EMRG?

50 Allyson Versprille, “Integration Biggest Challenge for Railgun,” National Defense, June 2015. See also Lance M.
Bacon, “3-Star: ‘Lot of Work’ Before Railgun Arrives in Fleet,” Navy Times, February 5, 2015.
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 Are the funding sources for SSLs, EMRG, and HVP in Navy and Defense-Wide
research and development accounts (see “Summary of Congressional Action on
FY2017 Funding” be
low) sufficiently visible for supporting congressional
oversight?
Legislative Activity for FY2017
Summary of Congressional Action on FY2017 Funding
Funding in the defense budget for research and development work on Navy SSLs, EMRG, and
HVP is spread across several research and development account line items (which are known as
program elements, or PEs). The PEs shown in Table 1 capture much but not necessarily all of the
funding for developing Navy SSLs, EMRG, and HVP. The PEs shown in the table, moreover,
include funding for efforts other than Navy SSLs, EMRG, and HVP, so congressional changes
from requested amounts might or might not relate to SSLs, EMRG, or HVP.
Table 1. Summary of Congressional Action on FY17 Funding
In millions of dollars, rounded to nearest tenth
Authorization
Appropriation
Program Element (PE) number, PE
name, FY16 budget line number
Req.
HASC
SASC
Conf.
HAC
SAC
Conf.
0602114N, Power Projection Applied
41.4
41.4
41.4

41.4
61.4

Research, line 4
0602750N, Future Naval Capabilities
165.1
165.1
165.1

157.1
165.1

Applied Research, line 13
0603114N, Power Projection Advanced
96.4
106.4
81.4

76.6
96.4

Technology, line 16
0603673N, Future Naval Capabilities
249.1
249.1
239.1

252.1
259.1

Advanced Technology Development, line 21
0603925N, Directed Energy and Electric
32.7
32.7
32.7

32.7
32.7

Weapon System, line 75
0604250D8Z, Advanced Innovative
844.9
804.9
844.9

844.9
829.9

Technology, line 95
Source: Table prepared by CRS based on Navy FY17 budget submission and committee and conference
reports.
Notes: HASC is House Armed Services Committee; SASC is Senate Armed Services Committee; HAC is
House Appropriations Committee; SAC is Senate Appropriations Committee; Conf. is conference agreement.
The PEs shown in the table below capture much but not necessarily all of the funding for work on Navy SSLs,
EMRG, and HVP. The PEs shown in the table, moreover, include funding for efforts other than Navy SSLs,
EMRG, and HVP.
FY2017 National Defense Authorization Act (H.R. 4909/S. 2943)
House
The House Armed Services Committee, in its report (H.Rept. 114-537 of May 4, 2016) on H.R.
4909, recommended the funding levels shown in the HASC column of Table 1. The
recommended increase of $10 million for PE 0603114N, Power Projection Advanced Technology
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(line 16) is for “Program increase for common mount.” (Page 498) The recommended reduction
of $40 million for PE 0604250D8Z, Advanced Innovative Technology (line 95) is for “SCO” (the
Strategic Capabilities Office). (Page 518) H.Rept. 114-537 states:
Common mount for electromagnetic railgun
The budget request contained $96.4 million in PE 63114N for power projection advanced
technology. Of this amount, $15.4 million was included for the Navy’s electromagnetic
railgun prototype.
The committee remains supportive of the Navy’s program for developing and deploying
an electromagnetic railgun. The committee recognizes the growing imperative for the
Navy to field this type of weapon, not only to increase capabilities for naval surface fire
support and ballistic missile defense, but to also decrease the cost exchange model when
comparing the railgun to conventional missiles or guns. However, the committee is
increasingly concerned that the shift in emphasis to the hypervelocity projectile by the
Strategic Capabilities Office has left the Navy with a funding gap in developing the
requirements and design for a common mount, which is a necessary prerequisite to
getting this capability into operational use. Therefore, the committee directs the Secretary
of the Navy to provide a briefing to the House Committee on Armed Services by
February 15, 2017, on the plan and milestone schedule for demonstrating and deploying a
common railgun mount for sea- and land-based applications.
The committee recommends $106.4 million, an increase of $10.0 million, in PE 63114N
to support the development of a common mount for the sea-based and land-based
electromagnetic railgun. (Page 61)
H.Rept. 114-537 also states:
Strategic Capabilities Office
The budget request contained $844.9 million in PE 64250D8Z for development activities
of the Strategic Capabilities Office (SCO).
Created in 2012 by the Deputy Secretary of Defense, SCO has the mission to identify,
analyze, demonstrate, and transition game-changing applications of existing and near-
term technology to shape and counter emerging threats. SCO is comprised of a relatively
small number of personnel and relies on other program office personnel and resources to
execute its mission. The committee appreciates the nature of SCO’s mission and
sustained leanness of the organization; however, the committee notes the budget for SCO
has grown exponentially each fiscal year. For example, the fiscal year 2017 budget
request is nearly double the request for fiscal year 2016.
The committee is concerned that such rapid budget growth may bring with it some risks,
including the demands on SCO’s small staff, demands on other Department of Defense
personnel, and impact of SCO decisions on existing programs. For example, the
committee is aware of SCO’s inclusion on the electromagnetic railgun development, and
subsequent reprioritizing of its planned investment in that program for fiscal year 2017,
resulting in a funding gap that could not be covered by the program office.
Additionally, the committee remains concerned that the transition of technologies from
SCO has not been adequately captured and conveyed to the oversight committees. The
report required by the committee report (H. Rept. 114–102) accompanying the National
Defense Authorization Act for Fiscal Year 2016 has not been delivered and is now almost
6 months late. In order to support prudent use of taxpayer resources, and to ensure proper
oversight of these activities, the committee believes this report should be provided and
concerns addressed before supporting full funding of planned activities.
Therefore, the committee recommends $804.9 million, a decrease of $40.0 million, in PE
64250D8Z for development activities of the Strategic Capabilities Office. (Page 92)
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Section 220 of H.R. 4909 as reported states:
SEC. 220. Designation of Department of Defense senior official with principal
responsibility for directed energy weapons.
Not later than 180 days after the date of the enactment of this Act, the Secretary of
Defense shall—
(1) designate a senior official already serving within the Department of Defense as the
official with principal responsibility for the development and demonstration of directed
energy weapons for the Department; and
(2) set forth the responsibilities of that senior official with respect to such programs.
H.Rept. 114-537 also states:
Five-inch precision guided projectile development for naval surface fire support
In the committee report (H. Rept. 114–102) accompanying the National Defense
Authorization Act for Fiscal Year 2016, the committee noted “that current surface Navy
gunnery requirements are outdated and that new technologies such as railgun and directed
energy weapons are nearing readiness for technology transition.” The committee
referenced the Advanced Naval Surface Fires (ANSF) initiative and noted the ANSF was
assessing options for providing a near-term 5-inch guided munition capability. The
committee understands this capability would provide for improved and extended-range
naval surface fire support. The committee continues to support the need for this precision
guided capability and is also aware of the Hypervelocity Gun Weapon System (HGWS)
program that is currently under consideration by the Strategic Capabilities Office (SCO).
The committee notes the HGWS program would “flip the cost equation using
conventional guns to defend forward bases against raids of advanced cruise and ballistic
missiles” and believes there could be applications for use in 5-inch gun systems for naval
surface fires support. The committee is encouraged by the development of both of these
initiatives and expects the Navy and SCO to coordinate on these capabilities. The
committee also expects the Navy to proceed forward with an accelerated development
and acquisition strategy for this needed capability that is consistent with acquisition
reform principles. (Pages 62-63)
H.Rept. 114-537 also states:
Technology enablers for directed energy weapon systems
The committee is aware that the Department of Defense has made significant advances in
the development and operational demonstration of directed energy weapons systems.
Each military department has demonstrated a marquee program in this area, such as the
Navy’s Laser Weapon System deployed on the USS Ponce, the Army High Energy Laser
Mobile Demonstrator, and the Marine Corps’ Ground Based Air Defense System. Along
with technology demonstration activities like the Robust Electric Laser Initiative and the
High Energy Liquid Laser Area Defense System, each of these programs demonstrated
the increased power output and power on target necessary to develop a militarily useful
directed energy weapon.
However, as the Department has made progress in raising the power levels of these
systems, it has also demonstrated the need for emphasis on development in other
technology areas necessary to realize the full potential of laser weapons. For example,
higher power output requires improved beam control to engage targets at greater
distances, as well as better thermal management systems to dissipate the increased heat
load. As the Department has been overcoming foundational technical challenges, new
challenges have emerged that will impact the operational uses for directed energy
weapons.
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Therefore, the committee directs the Assistant Secretary of Defense for Research and
Engineering, in coordination with the research components of the military departments
and the High Energy Laser Joint Technology Office, to provide a briefing to the House
Committee on Armed Services by January 20, 2017. This briefing should provide a
roadmap for enabling technologies, including:
(1) Beam directors and adaptive optics, including deformable mirrors;
(2) Thermal management needs and capabilities;
(3) Integration challenges with fire control systems, including potential
future needs for fire control for laser systems;
(4) Power architectures and power electronics needs;
(5) Facilities and test range capabilities; and
(6) Other areas as deemed by the Secretary. (Page 93)
Senate
The Senate Armed Services Committee, in its report (S.Rept. 114-255 of May 18, 2016) on S.
2943, recommended the funding levels shown in the SASC column of Table 1. The
recommended reduction of $15 million to PE 0603114N, Power Projection Advanced Technology
(line 16) is for “General decrease.” (Page 481) The recommended reduction of $10 million to PE
0603673N, Future Naval Capabilities Advanced Technology Development (line 21) is for
“Capable manpower, and power and energy.” (Page 481).51 S.Rept. 114-255 states:
Power projection advanced technology
The budget request included $96.4 million in PE 63114N for power projection advanced
technology. The committee notes that the Navy, Air Force, Defense Advanced Research
Projects Agency, Strategic Capabilities Office, and other elements within the Department
of Defense are all pursuing advanced power projection technologies and systems. The
committee is concerned that these efforts are not well-coordinated and have uncertain
pathways for transition to programs of record. In addition, the committee notes that the
budget request represents an almost 200 percent increase over the amount enacted for
fiscal year 2016. The committee believes that such a large increase in budget is not
warranted and is concerned about the ability of the programs to absorb the additional
funding. Consequently, the committee recommends a decrease of $15.0 million in PE
63114N, but directs that this reduction not be assessed against solid state laser maturation
efforts. (Page 52)
Section 216 of S. 2943 as reported states:

51 This recommended reduction of $10 million does not appear to relate (at least not directly) to lasers, the
electromagnetic railgun, or the HVP. S.Rept. 114-255 states:
Capable manpower and power and energy
The budget request included $249.1 million in PE 63673N for future naval capabilities advanced
technology developments. The activities listed under this program element include capable
manpower and power and energy. The committee believes that the work plans for fiscal year 2017
on these activities does not warrant the level of funding included in the budget request. For
example, the committee notes that the research included in these two projects include development
of new personnel and management methodologies, and capabilities in energy security. Both of
these efforts could be better coordinated with other organizations performing similar research.
Consequently, the committee recommends a decrease of $10.0 million in PE 63673N to be
distributed appropriately from capable manpower and power and energy. (Page 53)
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SEC. 216. Directed energy weapon system programs.
(a) Inclusion of Directed Energy Weapon System programs in the rapid acquisition
authority program.—
(1) IN GENERAL.—Section 806(c)(1) of the Bob Stump National Defense
Authorization Act for Fiscal Year 2003 (Public Law 107–314; 10 U.S.C. 2302 note) is
amended by adding at the end the following new subparagraph:
“(D) (i) In the case of any supplies and associated support services that, as determined in
writing by the Secretary of Defense without delegation, are urgently needed to eliminate
a deficiency in directed energy weapon systems, the Secretary may use the procedures
developed under this section in order to accomplish the rapid acquisition and deployment
of needed offensive or defensive directed energy weapon systems capabilities, supplies,
and associated support services.
“(ii) For the purposes of directed energy weapon systems acquisition, the Secretary of
Defense shall consider use of the following procedures:
“(I) The rapid acquisition authority provided under this section.
“(II) Use of other transactions authority provided under section 2371 of title 10, United
States Code.
“(III) The acquisition of commercial items using simplified acquisition procedures.
“(IV) The authority for procurement for experimental purposes provided under section
2373 of title 10, United States Code.
“(iii) In this subparagraph, the term ‘directed energy weapon systems’ means military
action involving the use of directed energy to incapacitate, damage, or destroy enemy
equipment, facilities, or personnel.”.
(2) CONFORMING AMENDMENTS.—Section 2373 of title 10, United States Code, is
amended—
(A) in subsection (a), by striking “and aeronautical supplies” and inserting “, aeronautical
supplies, and directed energy weapon systems”; and
(B) by adding at the end of the following new subsection:
“(c) Directed energy weapon systems defined.—In this section, the term ‘directed energy
weapon systems’ means military action involving the use of directed energy to
incapacitate, damage, or destroy enemy equipment, facilities, or personnel.”.
(b) Joint Directed Energy Program Office.—
(1) REDESIGNATION.—The High Energy Laser Joint Technology Office of the
Department of Defense is hereby redesignated as the “Joint Directed Energy Program
Office” (in this subsection referred to as the “Office”).
(2) STRATEGIC PLAN FOR DEVELOPMENT AND FIELDING OF DIRECTED
ENERGY WEAPONS CAPABILITIES.—In addition to the functions and duties of the
Office in effect on the day before the date of the enactment of this Act, the Office shall
develop a strategic plan for development and fielding of directed energy weapons
capabilities for the Department, in which the Office may define requirements for directed
energy capabilities that address the highest priority warfighting capability gaps of the
Department.
(3) ACCELERATION OF DEVELOPMENT AND FIELDING OF DIRECTED
ENERGY WEAPONS CAPABILITIES.—
(A) IN GENERAL.—To the degree practicable, the Office shall use the policies of the
Department that are revised pursuant to this section and new acquisition and management
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practices established pursuant to this section to accelerate the development and fielding
of directed energy capabilities.
(B) ENGAGEMENT.—The Secretary shall ensure that use of policies and practices
described in subparagraph (A) include engagement with defense and private industries,
research universities, and unaffiliated, nonprofit research institutions.
Regarding Section 216, S.Rept. 114-255 states:
Directed energy weapon system programs (sec. 216)
The committee remains concerned about the Department of Defense’s inability to field an
operational directed energy system. The committee is aware that the military services and
industry partners have developed sufficient directed energy weapon capabilities for
specific scenarios—like the High Energy Laser Mobile Demonstrator (HEL–MD) to
counter rocket, artillery and mortar for base protection purposes and the Counter
Electronics High Powered Microwave Advanced Missile Project (CHAMP) for disabling
an adversary’s electronics while avoiding collateral damage. These programs, as well as
other high energy laser weapon systems, have been tested and demonstrated, but have
failed to transition to acquisition programs of record.
The committee notes that directed energy capabilities have the potential to support many
operational missions in cost effective and efficient manners. In response to these factors,
the committee recommends a provision that would amend section 806 of the Bob Stump
National Defense Authorization Act for Fiscal Year 2003 (Public Law 107–314) to grant
rapid acquisition authorities for directed energy weapon systems to accelerate the
development and fielding of this technology and to help offset the gains of potential
adversaries.
The committee notes that since 1960, the Department of Defense has invested more than
$6.0 billion in directed energy science and technology initiatives. However, the
committee remains concerned that, despite this significant investment, the Department’s
directed energy initiatives are not resourced at levels necessary to transition them to full-
scale acquisition programs. The committee notes with concern that years of investment
have not to date resulted in any operational systems with high energy laser capability.
The committee highlights that the Defense Science Board Task Force on Directed Energy
Weapon Systems and Technology Applications found that “directed energy offers
promise as a transformational ‘game changer’ in military operations, able to augment and
improve operational capabilities in many areas.” The task force further concluded that the
range of potential applications is sufficient to warrant significantly increased attention to
the scope and direction of efforts to assess, develop, and field appropriate laser,
microwave, and millimeter wave weapons. Consistent with the findings of the task force,
the committee believes that directed energy weapons systems offer significant benefits in
terms of cost effectiveness, sustainability, magazine capabilities, and precision targeting.
(Pages 46-47)
S.Rept. 114-255 also states:
High energy laser joint technology office
The budget request included $42.3 million in PE 62890F for high energy laser research.
The committee notes that this program element funds defense high energy laser applied
research through the High Energy Laser Joint Technology Office. However, the
committee is concerned that the Joint Technology Office has not received sufficient
funding in recent years to drive the maturation of high energy laser technology. As an
example, the committee notes with concern that no laser technologies have yet been
fielded or deployed, despite promising development and field tests. Given the importance
of directed energy weapons systems in general as noted elsewhere in this Act, and of high
energy laser systems in particular, the committee is concerned that budget request for this
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program element will be insufficient for supporting the joint technology office.
Accordingly, the committee recommends an increase of $5.0 million in PE 62890F for
the high energy laser joint technology office. (Pages 54-55)
S.Rept. 114-255 also states:
Directed energy systems prototyping
The budget request included no money in PE 64342D8Z for defense technology offsets.
The committee notes with disappointment that the administration did not view it as a
priority to request funds through this program element. Particularly with the high-profile
emphasis placed on the Department of Defense’s Third Offset Strategy, the committee is
disappointed to see this program be unfunded. In addition, as noted elsewhere in this
report, the committee is deeply disappointed with how the technology offset funding
enacted in fiscal year 2016 was allocated. As noted, none of the money was put towards
directed energy, in contradiction to the clear intent of Congress that half of the money be
used to bolster directed energy technologies. While the committee does not recommend
additional unrestricted funds for the technology offsets program, the committee
underscores that directed energy systems are still critical areas of work in need of greater
support and attention. The committee believes that the Department needs to focus in
particular on the transition from lab development to deployment and fielding.
Consequently, the committee recommends a general increase of $25.0 million in PE
64342D8Z to be used only for the purposes of directed energy systems prototyping.
(Pages 59-60)
S.Rept. 114-255 also states:
Laser weapon system demonstrator
The Committee commends the Navy for initiating and funding the Laser Weapon
Systems Demonstrator (LWSD) and believes that this is an important step toward
maturing technologies that could ultimately enable the deployment of a shipboard
maritime laser weapons system. While the Committee understands that the Navy
envisions transitioning laser weapons to a formal Program of Record in the 2020s, it
appears that the Navy has not programmed funding beyond the LWSD sea-based tests to
support the installation of LWSD on a DDG or for the design and procurement of a
formal maritime laser program.
The committee expects that the Secretary of the Navy will keep the congressional defense
committees updated on its plan to seamlessly transition the LWSD to a shipboard
weapons system following sea-based testing and to a formal maritime laser Program of
Record, technical progress toward developing the capability, and programmatic steps
being taken to move to demonstration and deployment of advanced laser systems. (Page
70)
FY2017 DOD Appropriations Act (H.R. 5293/S. 3000)
House
The House Appropriations Committee, in its report (H.Rept. 114-577 of May 19, 2016) on H.R.
5293, recommended the funding levels shown in the HAC column of Table 1. The recommended
reduction of $8 million to PE 0602750N, Future Naval Capabilities Applied Research (line 13) is
for “FORCENET excessive growth” ($5 million), “Power and energy previously funded efforts”
($2 million), and “Sea shield previously funded efforts” ($1 million). (Page 228) The
recommended reduction of $19.8 million to PE 0603114N, Power Projection Advanced
Technology (line 16) is for “Precision strike technology excess growth.” (Page 228) The
recommended net reduction of $3 million to PE 0603673N, Future Naval Capabilities Advanced
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Technology Development (line 21) consists of a reduction of $2 million for “Power and energy
previously funded efforts,” a reduction of $2 million for “Sea shield previously funded efforts,”
and an increase of $7 million for “Program increase—ASW [antisubmarine warfare] research.”
(Page 228)
H.Rept. 114-577 states:
HIGH ENERGY LASERS
The Committee is aware of efforts within the High Energy Laser Joint Technology Office
to develop advanced, directed-energy, high energy laser weapons that have the potential
to perform a wide variety of military missions. The Committee encourages the Secretary
of Defense to explore further development and evaluation of this important technology.
(Page 264)
Senate
The Senate Appropriations Committee, in its report (S.Rept. 114-263 of May 26, 2016) on S.
3000, recommended the funding levels shown in the SAC column of Table 1. The recommended
increase of $20 million for PE 0602114N, Power Projection Applied Research (line 4) is for
“Program increase.” (Page 154) The recommended increase of $10 million for PE 0603673N,
Future Naval Capabilities Advanced Technology Development (line 21) is for “Program
increase.” (Page 154) The recommended reduction of $15 million for PE 0604250D8Z, Advanced
Innovative Technology (line 95) is for “Maintain program affordability: Program efficiencies.”
(Page 179)
S.Rept. 114-263 states:
High Energy Laser.—The Committee is concerned with the funding levels for the
primary test and evaluation facility for high energy laser [HEL] systems across the
Department of Defense. With directed energy interest and work increasing in the third
offset strategy, the Committee recommends the Department review the funding levels,
identify, and correct shortfalls as necessary. (Page 180)
Directed Energy Weapon Systems Acquisition Act of 2016 (H.R.
4964/S. 2778)

House
H.R. 4964 was introduced in the House on May 5, 2016. The text of H.R. 4964 as introduced
states:
SECTION 1. Short title.
This Act may be cited as the “Directed Energy Weapon Systems Acquisition Act of
2016”.
SEC. 2. Findings.
Congress makes the following findings:
(1) The Committee on Armed Services of the Senate noted in the report accompanying S.
1356 (S.Rept. 114-49; 114th Congress) that since 1960, the Department of Defense has
invested more than $6,000,000,000 in directed energy science and technology initiatives,
and that the Committee is concerned that, despite this significant investment, the
Department's directed energy initiatives are not resourced at levels necessary to transition
them to full-scale acquisition programs.
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(2) The Defense Science Board Task Force on Directed Energy Weapon Systems and
Technology Applications (the “Task Force”) found that “directed energy offers promise
as a transformational ‘game changer’ in military operations, able to augment and improve
operational capabilities in many areas”.
(3) Despite this potential, years of investment have not resulted in any operational
systems with high energy laser capability.
(4) The Task Force believes that the range of potential application is sufficient to warrant
significantly increased attention to the scope and direction of efforts to assess, develop,
and field appropriate laser, microwave, and millimeter wave weapons.
SEC. 3. Inclusion of directed energy weapon system programs in the rapid acquisition
authority program.
(a) In general.—Section 806(c)(1) of the Bob Stump National Defense Authorization Act
for Fiscal Year 2003 (Public Law 107–314; 10 U.S.C. 2302 note) is amended by adding
at the end the following new subparagraph:
“(D) (i) In the case of any supplies and associated support services that, as determined in
writing by the Secretary of Defense without delegation, are urgently needed to eliminate
a deficiency in directed energy weapon systems, the Secretary may use the procedures
developed under this section in order to accomplish the rapid acquisition and deployment
of needed offensive or defensive directed energy weapon systems capabilities, supplies,
and associated support services.
“(ii) For the purposes of directed energy weapon systems acquisition, the Secretary of
Defense shall consider use of the following procedures:
“(I) The rapid acquisition authority provided under this section.
“(II) Use of other transactions authority provided under section 2371 of title 10, United
States Code.
“(III) The acquisition of commercial items using simplified acquisition procedures.
“(IV) The authority for procurement for experimental purposes provided under section
2373 of title 10, United States Code.
“(iii) In this subparagraph, the term ‘directed energy weapon system’ means military
action involving the use of directed energy to incapacitate, damage, or destroy enemy
equipment, facilities, or personnel.”.
(b) Conforming amendments.—Section 2373 of title 10, United States Code, is
amended—
(1) in subsection (a), by striking “and aeronautical supplies” and inserting “, aeronautical
supplies, and directed energy weapon systems”; and
(2) by adding at the end of the following new subsection:
“(c) Directed energy weapon system defined.—In this section, the term ‘directed energy
weapon system’ means military action involving the use of directed energy to
incapacitate, damage, or destroy enemy equipment, facilities, or personnel.”.
SEC. 4. Joint Directed Energy Program Office.
(a) Redesignation.—The High Energy Laser Joint Technology Office of the Department
of Defense is hereby redesignated as the “Joint Directed Energy Program Office” (in this
section referred to as the “Office”).
(b) Strategic plan for development and transition of directed energy weapons capabilities
toward fielding.—In addition to the functions and duties of the Office in effect on the day
before the date of the enactment of this Act, the Office shall develop a strategic plan for
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development and transition of directed energy weapons capabilities toward fielding for
the Department, in which the Office may define requirements for directed energy
capabilities that address the highest priority warfighting capability gaps of the
Department.
(c) Acceleration of development and transition of directed energy weapons capabilities
toward fielding.—
(1) IN GENERAL.—To the degree practicable, the Office shall use the policies of the
Department that are revised pursuant to this Act and new acquisition and management
practices established pursuant to this Act to accelerate the development and transition of
directed energy capabilities toward fielding.
(2) ENGAGEMENT.—The Secretary shall ensure that use of policies and practices
described in paragraph (1) include engagement with defense and private industries,
research universities, and unaffiliated, nonprofit research institutions.
Senate
S. 2778 was introduced in the Senate on April 12, 2016. The text of S. 2778 as introduced states:
SECTION 1. Short title.
This Act may be cited as the “Directed Energy Weapon Systems Acquisition Act of
2016”.
SEC. 2. Findings.
Congress makes the following findings:
(1) The Committee on Armed Services of the Senate noted in the report accompanying S.
1356 (S.Rept. 114-49; 114th Congress) that since 1960, the Department of Defense has
invested more than $6,000,000,000 in directed energy science and technology initiatives,
and that the Committee is concerned that, despite this significant investment, the
Department's directed energy initiatives are not resourced at levels necessary to transition
them to full-scale acquisition programs.
(2) The Defense Science Board Task Force on Directed Energy Weapon Systems and
Technology Applications (the “Task Force”) found that “directed energy offers promise
as a transformational ‘game changer’ in military operations, able to augment and improve
operational capabilities in many areas”.
(3) Despite this potential, years of investment have not resulted in any operational
systems with high energy laser capability.
(4) The Task Force believes that the range of potential application is sufficient to warrant
significantly increased attention to the scope and direction of efforts to assess, develop,
and field appropriate laser, microwave, and millimeter wave weapons.
SEC. 3. Inclusion of directed energy weapon system programs in the rapid acquisition
authority program.
(a) In general.—Section 806(c)(1) of the Bob Stump National Defense Authorization Act
for Fiscal Year 2003 (Public Law 107–314; 10 U.S.C. 2302 note) is amended by adding
at the end the following new subparagraph:
“(D) (i) In the case of any supplies and associated support services that, as determined in
writing by the Secretary of Defense without delegation, are urgently needed to eliminate
a deficiency in directed energy weapon systems, the Secretary may use the procedures
developed under this section in order to accomplish the rapid acquisition and deployment
of needed offensive or defensive directed energy weapon systems capabilities, supplies,
and associated support services.
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“(ii) For the purposes of directed energy weapon systems acquisition, the Secretary of
Defense shall consider use of the following procedures:
“(I) The rapid acquisition authority provided under this section.
“(II) Use of other transactions authority provided under section 2371 of title 10, United
States Code.
“(III) The acquisition of commercial items using simplified acquisition procedures.
“(IV) The authority for procurement for experimental purposes provided under section
2373 of title 10, United States Code.
“(iii) In this subparagraph, the term ‘directed energy weapon system’ means military
action involving the use of directed energy to incapacitate, damage, or destroy enemy
equipment, facilities, or personnel.”.
(b) Conforming amendments.—Section 2373 of title 10, United States Code, is
amended—
(1) in subsection (a), by striking “and aeronautical supplies” and inserting “, aeronautical
supplies, and directed energy weapon systems”; and
(2) by adding at the end the following new subsection:
“(c) Directed energy weapon system defined.—In this section, the term ‘directed energy
weapon system’ means military action involving the use of directed energy to
incapacitate, damage, or destroy enemy equipment, facilities, or personnel.”.
SEC. 4. Joint Directed Energy Program Office.
(a) Redesignation.—The High Energy Laser Joint Technology Office of the Department
of Defense is hereby redesignated as the “Joint Directed Energy Program Office” (in this
section referred to as the “Office”).

(b) Strategic plan for development and transition of directed energy weapons capabilities
toward fielding.—In addition to the functions and duties of the Office in effect on the day
before the date of the enactment of this Act, the Office shall develop a strategic plan for
development and transition of directed energy weapons capabilities toward fielding for
the Department, in which the Office may define requirements for directed energy
capabilities that address the highest priority warfighting capability gaps of the
Department.
(c) Acceleration of development and transition of directed energy weapons capabilities
toward fielding.—
(1) IN GENERAL.—To the degree practicable, the Office shall use the policies of the
Department that are revised pursuant to this Act and new acquisition and management
practices established pursuant to this Act to accelerate the development and transition of
directed energy capabilities toward fielding.
(2) ENGAGEMENT.—The Secretary shall ensure that use of policies and practices
described in paragraph (1) include engagement with defense and private industries,
research universities, and unaffiliated, nonprofit research institutions.

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Appendix. Potential Advantages and Limitations of
Shipboard Lasers
This appendix presents additional information on potential advantages and limitations of
shipboard lasers.
Potential Advantages
In addition to a low marginal cost per shot and deep magazine, potential advantages of shipboard
lasers include the following:
Fast engagement times. Light from a laser beam can reach a target almost
instantly (eliminating the need to calculate an intercept course, as there is with
interceptor missiles) and, by remaining focused on a particular spot on the target,
cause disabling damage to the target within seconds. After disabling one target, a
laser can be redirected in several seconds to another target.
Ability to counter radically maneuvering missiles. Lasers can follow and
maintain their beam on radically maneuvering missiles that might stress the
maneuvering capabilities of Navy SAMs.
Precision engagements. Lasers are precision-engagement weapons—the light
spot from a laser, which might be several inches in diameter, affects what it hits,
while generally not affecting (at least not directly) separate nearby objects.
Graduated responses. Lasers can perform functions other than destroying
targets, including detecting and monitoring targets and producing nonlethal
effects, including reversible jamming of electro-optic (EO) sensors. Lasers offer
the potential for graduated responses that range from warning targets to
reversibly jamming their systems, to causing limited but not disabling damage (as
a further warning), and then finally causing disabling damage.
Potential Limitations
Potential limitations of shipboard lasers include the following:
Line of sight. Since laser light tends to fly through the atmosphere on an
essentially straight path, shipboard lasers would be limited to line-of-sight
engagements, and consequently could not counter over-the-horizon targets or
targets that are obscured by intervening objects. This limits in particular potential
engagement ranges against small boats, which can be obscured by higher waves,
or low-flying targets. Even so, lasers can rapidly reacquire boats obscured by
periodic swells.
Atmospheric absorption, scattering, and turbulence. Substances in the
atmosphere—particularly water vapor, but also things such as sand, dust, salt
particles, smoke, and other air pollution—absorb and scatter light from a
shipboard laser, and atmospheric turbulence can defocus a laser beam. These
effects can reduce the effective range of a laser. Absorption by water vapor is a
particular consideration for shipboard lasers because marine environments
feature substantial amounts of water vapor in the air. There are certain
wavelengths of light (i.e., “sweet spots” in the electromagnetic spectrum) where
atmospheric absorption by water vapor is markedly reduced. Lasers can be
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designed to emit light at or near those sweet spots, so as to maximize their
potential effectiveness. Absorption generally grows with distance to target,
making it in general less of a potential problem for short-range operations than
for longer-range operations. Adaptive optics, which make rapid, fine adjustments
to a laser beam on a continuous basis in response to observed turbulence, can
counteract the effects of atmospheric turbulence. Even so, lasers might not work
well, or at all, in rain or fog, preventing lasers from being an all-weather solution.
Thermal blooming. A laser that continues firing in the same exact direction for a
certain amount of time can heat up the air it is passing through, which in turn can
defocus the laser beam, reducing its ability to disable the intended target. This
effect, called thermal blooming, can make lasers less effective for countering
targets that are coming straight at the ship, on a constant bearing (i.e., “down-the-
throat” shots). Other ship self-defense systems, such as interceptor missiles or a
CIWS, might be more suitable for countering such targets. Most tests of laser
systems have been against crossing targets rather than “down-the-throat” shots.
In general, thermal blooming becomes more of a concern as the power of the
laser beam increases.
Saturation attacks. Since a laser can attack only one target at a time, requires
several seconds to disable it, and several more seconds to be redirected to the
next target, a laser can disable only so many targets within a given period of time.
This places an upper limit on the ability of an individual laser to deal with
saturation attacks—attacks by multiple weapons that approach the ship
simultaneously or within a few seconds of one another. This limitation can be
mitigated by installing more than one laser on the ship, similar to how the Navy
installs multiple CIWS systems on certain ships.
Hardened targets and countermeasures. Less-powerful lasers—that is, lasers
with beam powers measured in kilowatts (kW) rather than megawatts (MW)—
can have less effectiveness against targets that incorporate shielding, ablative
material, or highly reflective surfaces, or that rotate rapidly (so that the laser spot
does not remain continuously on a single location on the target’s surface) or
tumble. Small boats (or other units) could employ smoke or other obscurants to
reduce their susceptibility to laser attack.52 Measures such as these, however, can
increase the cost and/or weight of a weapon, and obscurants could make it more
difficult for small boat operators to see what is around them, reducing their
ability to use their boats effectively.
Risk of collateral damage to aircraft, satellites, and human eyesight. Since
light from an upward-pointing laser that does not hit the target would continue
flying upward in a straight line, it could pose a risk of causing unwanted
collateral damage to aircraft and satellites. The light emitted by SSLs being
developed by the Navy is of a frequency that can cause permanent damage to
human eyesight, including blinding. Blinding can occur at ranges much greater
than ranges for damaging targeted objects. Scattering of laser light off the target
or off fog or particulates in the air can pose a risk to exposed eyes.53

52 See, for example, “Kelsey D. Atherton, “China Plans To Defeat American Lasers With Smoke,” Popular Science,
May 3, 2016.
53 The United States in 1995 ratified the 1980 Convention on Prohibitions or Restriction on the Use of Certain
Conventional Weapons Which May be Deemed to be Excessively Injurious or to Have Indiscriminate Effects. An
(continued...)
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For additional background information on potential Navy shipboard SSLs, see CRS Report
R41526, Navy Shipboard Lasers for Surface, Air, and Missile Defense: Background and Issues
for Congress
, by Ronald O'Rourke.


Author Contact Information

Ronald O'Rourke

Specialist in Naval Affairs
rorourke@crs.loc.gov, 7-7610


(...continued)
international review of the convention began in 1994 and concluded in May 1996 with the adoption of, among other
things, a new Protocol IV on blinding laser weapons. The protocol prohibits the employment of lasers that are
specifically designed to cause permanent blindness to the naked eye or to the eye with corrective eyesight devices. The
United States ratified Protocol IV on December 23, 2008, and it entered into force for the United States on July 21,
2009. DOD views the protocol as fully consistent with DOD policy. DOD believes the lasers discussed in this report
are consistent with DOD policy of prohibiting the use of lasers specifically designed to cause permanent blindness to
the naked eye or to the eye with corrective eyesight devices. For further discussion, see Appendix I (“Protocol on
Blinding Lasers”) in CRS Report R41526, Navy Shipboard Lasers for Surface, Air, and Missile Defense: Background
and Issues for Congress
, by Ronald O'Rourke.
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