Hypersonic Weapons:
October 19, 2021
Background and Issues for Congress
Kelley M. Sayler
The United States has actively pursued the development of hypersonic weapons—
Analyst in Advanced
maneuvering weapons that fly at speeds of at least Mach 5—as a part of its conventional
Technology and Global
prompt global strike program since the early 2000s. In recent years, the United States
Security
has focused such efforts on developing hypersonic glide vehicles, which are launched

from a rocket before gliding to a target, and hypersonic cruise missiles, which are

powered by high-speed, air-breathing engines during flight. As Vice Chairman of the
Joint Chiefs of Staff and former Commander of U.S. Strategic Command General John Hyten has stated, these
weapons could enable “responsive, long-range, strike options against distant, defended, and/or time-critical
threats [such as road-mobile missiles] when other forces are unavailable, denied access, or not preferred.” Critics,
on the other hand, contend that hypersonic weapons lack defined mission requirements, contribute little to U.S.
military capability, and are unnecessary for deterrence.
Funding for hypersonic weapons has been relatively restrained in the past; however, both the Pentagon and
Congress have shown a growing interest in pursuing the development and near-term deployment of hypersonic
systems. This is due, in part, to the advances in these technologies in Russia and China, both of which have a
number of hypersonic weapons programs and have likely fielded operational hypersonic glide vehicles—
potential y armed with nuclear warheads. Most U.S. hypersonic weapons, in contrast to those in Russia and
China, are not being designed for use with a nuclear warhead. As a result, U.S. hypersonic weapons wil likely
require greater accuracy and wil be more technical y chal enging to develop than nuclear-armed Chinese and
Russian systems.
The Pentagon’s FY2022 budget request for hypersonic research is $3.8 bil ion—up from $3.2 bil ion in the
FY2021 request. The Missile Defense Agency additional y requested $247.9 mil ion for hypersonic defense. At
present, the Department of Defense (DOD) has not established any programs of record for hypersonic weapons,
suggesting that it may not have approved either mission requirements for the systems or long-term funding plans.
Indeed, as Principal Director for Hypersonics (Office of the Under Secretary of Defense for Research and
Engineering) Mike White has stated, DOD has not yet made a decision to acquire hypersonic weapons and is
instead developing prototypes to assist in the evaluation of potential weapon system concepts and mission sets.
As Congress reviews the Pentagon’s plans for U.S. hypersonic weapons programs, it might consider questions
about the rationale for hypersonic weapons, their expected costs, and their implications for strategic stability and
arms control. Potential questions include the following:
 What mission(s) wil hypersonic weapons be used for? Are hypersonic weapons the most cost-
effective means of executing these potential missions? How wil they be incorporated into joint
operational doctrine and concepts?
 Given the lack of defined mission requirements for hypersonic weapons, how should Congress
evaluate funding requests for hypersonic weapons programs or the balance of funding requests
for hypersonic weapons programs, enabling technologies, and supporting test infrastructure? Is an
acceleration of research on hypersonic weapons, enabling technologies, or hypersonic missile
defense options both necessary and technological y feasible?
 How, if at al , wil the fielding of hypersonic weapons affect strategic stability?
 Is there a need for risk-mitigation measures, such as expanding New START, negotiating new
multilateral arms control agreements, or undertaking transparency and confidence-building
activities?

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Hypersonic Weapons: Background and Issues for Congress

Introduction
The United States has actively pursued the development of hypersonic weapons as a part of its
conventional prompt global strike (CPGS) program since the early 2000s.1 In recent years, it has
focused such efforts on hypersonic glide vehicles and hypersonic cruise missiles with shorter and
intermediate ranges for use in regional conflicts. Although funding for these programs has been
relatively restrained in the past, both the Pentagon and Congress have shown a growing interest in
pursuing the development and near-term deployment of hypersonic systems. This is due, in part,
to advances in these technologies in Russia and China, leading to a heightened focus in the
United States on the strategic threat posed by hypersonic flight. Open-source reporting indicates
that both China and Russia have conducted numerous successful tests of hypersonic glide
vehicles and likely fielded an operational capability.
Experts disagree on the potential impact of competitor hypersonic weapons on both strategic
stability and the U.S. military’s competitive advantage. Nevertheless, former Under Secretary of
Defense for Research and Engineering (USD[R&E]) Michael Griffin has testified to Congress
that the United States does not “have systems which can hold [China and Russia] at risk in a
corresponding manner, and we don’t have defenses against [their] systems.”2 Although the John
S. McCain National Defense Authorization Act for Fiscal Year 2019 (FY2019 NDAA, P.L. 115-
232) accelerated the development of hypersonic weapons, which USD(R&E) identifies as a
priority research and development area, the United States is unlikely to field an operational
system before 2023. However, most U.S. hypersonic weapons programs, in contrast to those in
Russia and China, are not being designed for use with a nuclear warhead.3 As a result, U.S.
hypersonic weapons wil likely require greater accuracy and wil be more technical y chal enging
to develop than nuclear-armed Chinese and Russian systems.
In addition to accelerating development of hypersonic weapons, Section 247 of the FY2019
NDAA required that the Secretary of Defense, in coordination with the Director of the Defense
Intel igence Agency, produce a classified assessment of U.S. and adversary hypersonic weapons
programs, to include the following elements:
(1) An evaluation of spending by the United States and adversaries on such technology.
(2) An evaluation of the quantity and quality of research on such technology.
(3) An evaluation of the test infrastructure and workforce supporting such technology.
(4) An assessment of the technological progress of the United States and adversaries on
such technology.
(5) Descriptions of timelines for operational deployment of such technology.

1 For details, see CRS Report R41464, Conventional Prompt Global Strike and Long-Range Ballistic Missiles:
Background and Issues, by Amy F. Woolf.
2 U.S. Congress, Senate Committee on Armed Services, “T estimony of Michael Griffin,” Hearing on New
T echnologies to Meet Emerging T hreats, April 18, 2018, https://www.armed-services.senate.gov/imo/media/doc/18-
40_04-18-18.pdf.
3 Until recently, the United States was not believed to be considering the development of nuclear-armed hypersonic
weapons; however, a since-revoked Air Force solicitation sought ideas for a “ thermal protection system that can
support [a] hypersonic glide to ICBM ranges.” Senior defense officials responded to news reports of the revocation,
stating that DOD “remains committ ed to non-nuclear role for hypersonics.” See Steve T rimble, “USAF Errantly
Reveals Research on ICBM-Range Hypersonic Glide Vehicle,” Aviation Week, August 18, 2020,
https://aviationweek.com/defense-space/missile-defense-weapons/usaf-errantly-reveals-research-icbm-range-
hypersonic-glide.
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(6) An assessment of the intent or willingness of adversaries to use such technology.4
This report was delivered to Congress in July 2019. Similarly, Section 1689 of the FY2019
NDAA requires the Director of the Missile Defense Agency to produce a report on “how
hypersonic missile defense can be accelerated to meet emerging hypersonic threats.”5 The
findings of these reports could hold implications for congressional authorizations, appropriations,
and oversight.
The following report reviews the hypersonic weapons programs in the United States, Russia, and
China, providing information on the programs and infrastructure in each nation, based on
unclassified sources. It also provides a brief summary of the state of global hypersonic weapons
research development. It concludes with a discussion of the issues that Congress might address as
it considers DOD’s funding requests for U.S. hypersonic technology programs.
Background
Several countries are developing hypersonic weapons, which fly at speeds of at least Mach 5 (five
times the speed of sound).6 There are two primary categories of hypersonic weapons:
 Hypersonic glide vehicles (HGV) are launched from a rocket before gliding to a
target.7
 Hypersonic cruise missiles are powered by high-speed, air-breathing engines, or
“scramjets,” after acquiring their target.
Unlike bal istic missiles, hypersonic weapons do not follow a bal istic trajectory and can
maneuver en route to their destination. As Vice Chairman of the Joint Chiefs of Staff and former
Commander of U.S. Strategic Command General John Hyten has stated, hypersonic weapons
could enable “responsive, long-range, strike options against distant, defended, and/or time-critical
threats [such as road-mobile missiles] when other forces are unavailable, denied access, or not
preferred.”8 Conventional hypersonic weapons use only kinetic energy—energy derived from
motion—to destroy unhardened targets or, potential y, underground facilities.9
Hypersonic weapons could chal enge detection and defense due to their speed, maneuverability,
and low altitude of flight.10 For example, terrestrial-based radar cannot detect hypersonic
weapons until late in the weapon’s flight.11 Figure 1 depicts the differences in terrestrial-based
radar detection timelines for bal istic missiles versus hypersonic glide vehicles.

4 P.L. 115-232, Section 2, Division A, T itle II, §247.
5 P.L. 115-232, Section 2, Division A, T itle XVI, §1689.
6 At a minimum, the United States, Russia, China, Australia, India, France, Germany, and Japan are developing
hypersonic weapons technology. See Richard H. Speier et al., Hypersonic Missile Proliferation: Hindering the Spread
of a New Class of Weapons, RAND Corporation, 2017, https://www.rand.org/pubs/research_reports/RR2137.html; and
Mike Yeo, “Japan unveils its hypersonic weapons plans,” Defense News, March 14, 2020.
7 When HGVs are mated with their rocket booster, the resulting weapon system is often referred to as a hypersonic
boost -glide weapon.
8 U.S. Congress, Senate Committee on Armed Services, “T estimony of John E. Hyten,” Hearing on United States
Strategic Command and United States Northern Command, February 26, 2019, https://www.armed-services.senate.gov/
imo/media/doc/Hyten_02-26-19.pdf.
9 Richard H. Speier et al., Hypersonic Missile Proliferation: Hindering the Spread of a New Class of Weapons, p. 13.
10 See Department of Defense, 2019 Missile Defense Review, https://www.defense.gov/Portals/1/Interactive/2018/11-
2019-Missile-Defense-Review/T he%202019%20MDR_Executive%20Summary.pdf.
11 Richard H. Speier et al., Hypersonic Missile Proliferation: Hindering the Spread of a New Class of Weapons.
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Figure 1. Terrestrial-Based Detection of Ballistic Missiles vs.
Hypersonic Glide Vehicles

Source: CRS image based on an image in “Gliding missiles that fly faster than Mach 5 are coming,” The
Economist, April 6, 2019, https://www.economist.com/science-and-technology/2019/04/06/gliding-missiles-that-fly-
faster-than-mach-5-are-coming.
This delayed detection compresses the timeline for decisionmakers assessing their response
options and for a defensive system to intercept the attacking weapon—potential y permitting only
a single intercept attempt.12
Furthermore, U.S. defense officials have stated that both terrestrial- and current space-based
sensor architectures are insufficient to detect and track hypersonic weapons, w ith former
USD(R&E) Griffin noting that “hypersonic targets are 10 to 20 times dimmer than what the U.S.
normal y tracks by satel ites in geostationary orbit.”13 Some analysts have suggested that space-
based sensor layers—integrated with tracking and fire-control systems to direct high-performance
interceptors or directed energy weapons—could theoretical y present viable options for defending
against hypersonic weapons in the future.14 Indeed, the 2019 Missile Defense Review notes that
“such sensors take advantage of the large area viewable from space for improved tracking and
potential y targeting of advanced threats, including HGVs and hypersonic cruise missiles.”15
Other analysts have questioned the affordability, technological feasibility, and/or utility of wide-
area hypersonic weapons defense.16 As physicist and nuclear expert James Acton explains, “point-
defense systems, and particularly [Terminal High-Altitude Area Defense (THAAD)], could very
plausibly be adapted to deal with hypersonic missiles. The disadvantage of those systems is that
they can only defend smal areas. To defend the whole of the continental United States, you

12 Bradley Perrett et al., “U.S. Navy sees Chinese HGV as part of Wider T hreat,” Aviation Week, January 27, 2014.
13 David Vergun, “DOD Scaling Up Effort to Develop Hypersonics,” DoD News, December 13, 2018,
https://dod.defense.gov/News/Article/Article/1712954/dod-scaling-up-effort-to-develop-hypersonics/; see also
“T estimony of Michael Griffin”; and “T estimony of John E. Hyten.”
14 “T estimony of Michael Griffin”; and “T estimony of John E. Hyten.”
15 Department of Defense, 2019 Missile Defense Review, p. XVI, https://www.defense.gov/Portals/1/Interactive/2018/
11-2019-Missile-Defense-Review/T he%202019%20MDR_Executive%20Summary.pdf.
16 See James M. Acton, “Hypersonic Weapons Explainer,” Carnegie Endowment for International Peace, April 2, 2018,
https://carnegieendowment.org/2018/04/02/hypersonic-weapons-explainer-pub-75957; and Margot van Loon,
“Hypersonic Weapons: A Primer.”
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would need an unaffordable number of THAAD batteries.”17 In addition, some analysts have
argued that the United States’ current command and control architecture would be incapable of
“processing data quickly enough to respond to and neutralize an incoming hypersonic threat.”18
(For additional information on hypersonic missile defense, see CRS In Focus IF11623,
Hypersonic Missile Defense: Issues for Congress, by Kel ey M. Sayler and Stephen M. McCal .)
United States
The Department of Defense (DOD) is currently developing hypersonic weapons under the Navy’s
Conventional Prompt Strike program, which is intended to provide the U.S. military with the
ability to strike hardened or time-sensitive targets with conventional warheads, as wel as through
several Air Force, Army, and DARPA programs.19 Those who support these development efforts
argue that hypersonic weapons could enhance deterrence, as wel as provide the U.S. military
with an ability to defeat capabilities such as advanced air and missile defense systems that form
the foundation of U.S. competitors’ anti-access/area denial strategies.20 In recognition of this, the
2018 National Defense Strategy identifies hypersonic weapons as one of the key technologies
“[ensuring the United States] wil be able to fight and win the wars of the future.”21 Similarly, the
House Armed Services Committee’s bipartisan Future of Defense Task Force Report notes that
hypersonic weapons could present chal enges to the United States in the years to come.22
Programs
Unlike programs in China and Russia, U.S. hypersonic weapons are to be conventional y armed.
As a result, U.S. hypersonic weapons wil likely require greater accuracy and wil be more
technical y chal enging to develop than nuclear-armed Chinese and Russian systems. Indeed,
according to one expert, “a nuclear-armed glider would be effective if it were 10 or even 100
times less accurate [than a conventional y-armed glider]” due to nuclear blast effects.23
According to open-source reporting, the United States is conducting research, development, test,
and evaluation (RDT&E) on a number of offensive hypersonic weapons and hypersonic
technology programs, including the following (see Table 1):

17 Acton, “Hypersonic Weapons Explainer.”
18 Margot van Loon, “Hypersonic Weapons: A Primer” in Defense Technology Program Brief: Hypersonic Weapons,
American Foreign Policy Council, May 17, 2019. Some analysts have suggested that future command and control
systems may require autonomous functionality to manage the speed and unpredictability of hypersonic weapons. See
John L. Dolan, Richard K. Gallagher, and David L. Mann, “Hypersonic Weapons Are Literally Unstoppable (As in
America Can’t Stop T hem),” Real Clear Defense, April 23, 2019, https://www.realcleardefense.com/articles/2019/04/
23/hypersonic_weapons__a_threat_to_national_security_114358.html.
19 For a full history of U.S. hypersonic weapons programs, see CRS Report R41464, Conventional Prompt Global
Strike and Long-Range Ballistic Missiles: Background and Issues, by Amy F. Woolf.
20 Roger Zakheim and T om Karako, “China’s Hypersonic Missile Advances and U.S. Defense Responses,” Remarks at
the Hudson Institute, March 19, 2019. See also Department of Defense Fiscal Year (FY) 2020 Budget Estimates, Army
Justification Book of Research, Development, T est and Evaluation, Volume II, Budget Activity 4, p. 580.
21 Department of Defense, “Summary of the 2018 National Defense Strategy of T he United States of America,” p. 3,
https://dod.defense.gov/Portals/1/Documents/pubs/2018-National-Defense-Strategy-Summary.pdf.
22 House Armed Services Committee, Future of Defense Task Force Report 2020, September 2020,
https://armedservices.house.gov/_cache/files/2/6/26129500 -d208-47ba-a9f7-
25a8f82828b0/424EB2008281A3C79BA8C7EA71890AE9.future-of-defense-task-force-report.pdf.
23 James M. Acton, “China’s Advanced Weapons,” T estimony to the U.S. China Economic and Security Review
Commission, February 23, 2017, https://carnegieendowment.org/2017/02/23/china-s-advanced-weapons-pub-68095.
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 U.S. Navy—Conventional Prompt Strike (CPS);
 U.S. Army—Long-Range Hypersonic Weapon (LRHW);
 U.S. Air Force—AGM-183 Air-Launched Rapid Response Weapon (ARRW,
pronounced “arrow”);
 U.S. Air Force—Hypersonic Attack Cruise Missile (HACM);
 DARPA—Tactical Boost Glide (TBG);
 DARPA—Operational Fires (OpFires); and
 DARPA—Hypersonic Air-breathing Weapon Concept (HAWC, pronounced
“hawk”).
These programs are intended to produce operational prototypes, as there are currently no
programs of record for hypersonic weapons.24
U.S. Navy
In a June 2018 memorandum, DOD announced that the Navy would lead the development of a
common glide vehicle for use across the services.25 The common glide vehicle is being adapted
from a Mach 6 Army prototype warhead, the Alternate Re-Entry System, which was successfully
tested in 2011 and 2017.26 Once development is complete, “Sandia National Laboratories, the
designer of the original concept, then wil build the common glide vehicles. ... Booster systems
are being developed separately.”27
The Navy’s Conventional Prompt Strike (CPS) is expected to pair the common glide vehicle with
a booster system to create a common Al Up Round (AUR) for use by both the Navy and Army.
According to the Navy’s FY2022 budget documents, the Navy intends to conduct testing in
support of CPS’s deployment on Zumwalt-class destroyers by FY2025 and Virginia-class
submarines by FY2028.28 Although Navy officials have previously noted plans to achieve
“limited operating capability” on Ohio-class submarines as early as 202529 and to eventual y field
hypersonic weapons on Burke-class destroyers, such plans are not reflected in FY2022 budget

24 Steve T rimble, “New Long-T erm Pentagon Plan Boosts Hypersonics, But Only Prototypes,” Aviation Week, March
15, 2019, https://aviationweek.com/defense/new-long-term-pentagon-plan-boosts-hypersonics-only-prototypes.
25 T he services coordinate efforts on a Common Hypersonic Glide Body Board of Directors with rotating chairmanship.
Sydney J. Freedberg, Jr., “Army Ramps Up Funding For Laser Shield, Hypersonic Sword,” Breaking Defense,
February 28, 2020, https://breakingdefense.com/2020/02/army-ramps-up-funding-for-laser-shield-hypersonic-sword/.
26 Steve T rimble and Guy Norris, “Sandia’s Swerve Could Lead to First -gen Hypersonic Production Line,” Aviation
Week, October 11, 2018, http://aviationweek.com/air-dominance/sandia-s-swerve-could-lead-first-gen-hypersonic-
production-line; and Sydney J. Freedberg Jr., “ Army Warhead Is Key T o Joint Hypersonics,” Breaking Defense,
August 22, 2018, https://breakingdefense.com/2018/08/army-warhead-is-key-to-joint-hypersonics/.
27 Steve T rimble and Guy Norris, “Sandia’s Swerve Could Lead to First -gen Hypersonic Production Line,” Aviation
Week, October 11, 2018, http://aviationweek.com/air-dominance/sandia-s-swerve-could-lead-first-gen-hypersonic-
production-line.
28 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Navy Justification Book of Research,
Development, T est and Evaluation, Volume II, Budget Activity 4, p. 1466,
https://www.secnav.navy.mil/fmc/fmb/Documents/22pres/RDT EN_BA4_Book.pdf .
29 Department of the Navy, “Highlights of the Depart ment of the Navy FY 2021 Budget,” February 10, 2020,
https://www.secnav.navy.mil/fmc/fmb/Documents/21pres/Highlights_book.pdf; and Megan Eckstein, “ Navy Says
Hypersonic Weapons Coming to Subs in 5 Years,” USNI News, November 17, 2020, https://news.usni.org/2020/11/17/
navy-says-hypersonic-weapons-coming-to-subs-in-5-years.
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documents.30 The Navy is requesting $1.4 bil ion for CPS RDT&E in FY2022—an increase of
$366 mil ion over the FY2021 request and $607 mil ion over the FY2021 appropriation.31
U.S. Army
The Army’s Long-Range Hypersonic Weapon program is expected to pair the common glide
vehicle with the Navy’s booster system. The system is intended to have a range of over 1,725
miles and “provide the Army with a prototype strategic attack weapon system to defeat A2/AD
capabilities, suppress adversary Long Range Fires, and engage other high payoff/time sensitive
targets.”32 The Army is requesting $301 mil ion in RDT&E for the program in FY2022—$500
mil ion under the FY2021 request and $531 mil ion under the FY2021 appropriation.33 It plans to
conduct flight tests for LRHW in FY2022 and FY2023, field an experimental prototype in
FY2023, and transition to a program of record in the fourth quarter of FY2024.34
U.S. Air Force
The AGM-183 Air-Launched Rapid Response Weapon is expected to leverage DARPA’s Tactical
Boost Glide technology to develop an air-launched hypersonic glide vehicle prototype capable of
travel ing at average speeds of between Mach 6.5 and Mach 8 at a range of approximately 1,000
miles.35 Despite testing delays due to technical chal enges, ARRW successfully completed a
“captive carry” test flight in June 2019; its first free-flight test failed in April 2021.36 The Air
Force has requested $238 mil ion for ARRW RDT&E in FY2022—$144 mil ion under the

30 David B. Larter, “All US Navy destroyers will get hypersonic missiles, says T rump’s national security adviser,”
Defense News, October 21, 2020, https://www.defensenews.com/naval/2020/10/21/all-us-navy-destroyers-will-get-
hypersonic-missiles-trumps-national-security-advisor-says/.
31 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Navy Justification Book of Research,
Development, T est and Evaluation, Volume II, Budget Activity 4, p. 1466,
https://www.secnav.navy.mil/fmc/fmb/Documents/22pres/RDT EN_BA4_Book.pdf .
32 Sydney J. Freedberg Jr., “Army Discloses Hypersonic LRHW Range Of 1,725 Miles; Watch Out China,” Breaking
Defense, May, 12 2021, https://breakingdefense.com/2021/05/army-discloses-hypersonic-lrhw-range-of-1725-miles-
watch-out-china/; and https://breakingdefense.com/2019/03/army-sets-2023-hypersonic-flight-test-strategic-cannon-
advances/ Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Army Justification Book of Research,
Development, T est and Evaluation, Volume II, Budget Activity 4, p. 639,
https://www.asafm.army.mil/Portals/72/Documen ts/BudgetMaterial/2022/Base%20Budget/rdte/RDT E_BA_4_FY_202
2_PB.pdf.
33 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Army Justification Book of Research,
Development, T est and Evaluation, Volume II, Budget Activity 4, p. 639,
https://www.asafm.army.mil/Portals/72/Documents/BudgetMaterial/2022/Base%20Budget/rdte/RDT E_BA_4_FY_202
2_PB.pdf.
34 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Army Justification Book of Research,
Development, T est and Evaluation, Volume II, Budget Activity 4,
https://www.asafm.army.mil/Portals/72/Documents/BudgetMaterial/2022/Base%20Budget/rdte/RDT E_BA_4_FY_202
2_PB.pdf.
35 ARRW is expected to be launched initially from the B-52H strategic bomber. T homas Newdick, “Air Force Says
New Hypersonic Missile Will Hit T argets 1,000 Miles Away In Under 12 Minutes,” The Drive, October 13, 2020,
https://www.thedrive.com/the-war-zone/37045/air-force-says-new-hypersonic-missile-will-hit-targets-1000-miles-
away-in-under-12-minutes.
36 Oriana Pawlyk, “Air Force’s Hypersonic ARRW Missile Fails First Flight T est,” Military.com , April 6, 2021,
https://www.military.com/daily-news/2021/04/06/air-forces-hypersonic-arrw-missile-fails-first-flight -test.html#:~:text=
In%20June%202019%2C%20the%20service,early%202020s%2C%20the%20release%20states.
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FY2021 request and $148 mil ion under the FY2021 appropriation.37 In addition, the Air Force
has requested $161 mil ion in FY2022 for the procurement of an estimated 12 ARRW missiles.38
In February 2020, the Air Force announced that it had cancel ed its second hypersonic weapon
program, the Hypersonic Conventional Strike Weapon (HCSW), which had been expected to use
the common glide vehicle and booster system, due to budget pressures that forced it to choose
between ARRW and HCSW.39 Then-Air Force acquisition chief Wil Roper explained that ARRW
was selected because it was more advanced and gave the Air Force additional options. “[ARRW]
is smal er; we can carry twice as many on the B-52, and it’s possible it could be on the F-15,” he
explained.40 A senior Air Force official has since noted that a B-52 could potential y carry four
ARRWs.41
Final y, in FY2022, the Air Force launched the Hypersonic Attack Cruise Missile (HACM)
program to develop a hypersonic cruise missile that integrates Air Force and DARPA
technologies. Some reports indicate that HACM is intended to be launched from both bombers
and fighter aircraft, with a senior Air Force official noting that a B-52 could potential y carry 20
HACMs or more.42 According to the Air Force, “the ability to execute HACM development is
contingent upon fully funded and successful predecessor capability development efforts.”43 The
Air Force requested $200 mil ion for HACM in FY2022.44
The Air Force is also seeking information from industry on the Expendable Hypersonic Air-
Breathing Multi-Mission Demonstrator Program, alternatively known as Project Mayhem.
According to Principal Director for Hypersonics Mike White, “Project Mayhem is to look at the
next step in what the opportunity space al ows relative to hypersonic cruise missile systems” and
is intended to be capable of flying “significantly longer ranges than what we’re doing today.”45

37 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Air Force Justification Book of Research,
Development, T est and Evaluation, Volume II, p. 139,
https://www.saffm.hq.af.mil/Portals/84/documents/FY22/RDT E_/FY22%20DAF%20J-Book%20-%203600%20-
%20AF%20RDT %20and%20E%20Vol%20II.pdf?ver=KpJJbVq68o32dSvkjuv_Iw%3d%3d.
38 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Air Force Justification Book of Missile
Procurement, Volume I, p. 19,
https://www.saffm.hq.af.mil/Portals/84/documents/FY22/PROCUREMENT _/FY22%20DAF%20J-Book%20-
%203020%20-%20Missile%20Proc.pdf?ver=GIEj1YH2GS-elMys1wLm1A%3d%3d.
39 Valerie Insinna, “US Air Force kills one of its hypersonic weapons programs,” Defense News, February 10, 2020,
https://www.defensenews.com/smr/federal-budget/2020/02/10/the-air-force-just-canceled-one-of-its-hypersonic-
weapons-programs/.
40 John A. T irpak, “Roper: T he ARRW Hypersonic Missile Better Option for USAF,” Air Force Magazine, March 2,
2020, https://www.airforcemag.com/arrw-beat-hcsw-because-its-smaller-better-for-usaf/. T irpak additionally notes that
“the F-15 could accelerate the ARRW to Mach 3 before launch, potentially reducing the size of the booster needed to
get the weapon to hypersonic speed.”
41 John A. T irpak, “Air Force Will T ry Again to Launch ARRW Hypersonic Missile in July,” Air Force Magazine,
June 3, 2021, https://www.airforcemag.com/air-force-july-launch-arrw-hypersonic-missile/.
42 John A. T irpak, “Air Force Will T ry Again to Launch ARRW Hypersonic Missile in July,” Air Force Magazine,
June 3, 2021, https://www.airforcemag.com/air-force-july-launch-arrw-hypersonic-missile/.
43 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Air Force Justification Book of Research,
Development, T est and Evaluation, Volume II, p. 148,
https://www.saffm.hq.af.mil/Portals/84/documents/FY22/RDT E_/FY22%20DAF%20J-Book%20-%203600%20-
%20AF%20RDT %20and%20E%20Vol%20II.pdf?ver=KpJJbVq68o32dSvkjuv_Iw%3d%3d.
44 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Air Force Justification Book of Research,
Development, T est and Evaluation, Volume II, p. 139,
https://www.saffm.hq.af.mil/Portals/84/documents/FY22/RDT E_/FY22%20DAF%20J-Book%20-%203600%20-
%20AF%20RDT %20and%20E%20Vol%20II.pdf?ver=KpJJbVq68o32dSvkjuv_Iw%3d%3d.
45 Mike White, Remarks at the Center for Strategic and International Studies, “Hypersonic Strike and Defense: A
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Mayhem is reported to be larger than ARRW and capable of carrying multiple payloads for
different mission sets.46
DARPA
DARPA, in partnership with the Air Force, continues to test Tactical Boost Glide, a wedge-shaped
hypersonic glide vehicle capable of Mach 7+ flight that “aims to develop and demonstrate
technologies to enable future air-launched, tactical-range hypersonic boost glide systems.”47 TBG
wil “also consider traceability, compatibility, and integration with the Navy Vertical Launch
System” and is planned to transition to both the Air Force and the Navy. DARPA has requested
$50 mil ion for TBG in FY2022—$67 mil ion under the FY2021 request and $32 mil ion under
the FY2021 appropriation.48
DARPA’s Operational Fires reportedly seeks to leverage TBG technologies to develop a ground-
launched system that wil enable “advanced tactical weapons to penetrate modern enemy air
defenses and rapidly and precisely engage critical time sensitive targets.” DARPA has requested
$45 mil ion for OpFires in FY2022—$5 mil ion over the FY2021 request and $3 mil ion under
the FY2022 appropriation.49
In the longer term, DARPA, with Air Force support, is continuing work on the Hypersonic Air-
breathing Weapon Concept, which “seeks to develop and demonstrate critical technologies to
enable an effective and affordable air-launched hypersonic cruise missile.”50 Principal Director
for Hypersonics Mike White has stated that such a missile would be smal er than DOD’s
hypersonic glide vehicles and could therefore launch from a wider range of platforms. Principal
Director White has additional y noted that HAWC and other hypersonic cruise missiles could
integrate seekers more easily than hypersonic glide vehicles.51 DARPA requested $10 mil ion to
develop HAWC in FY2022—$10 mil ion under the FY2021 request and $21 mil ion under the
FY2021 appropriation.52

Conversation with Mike White,” June 10, 2021, https://www.csis.org/analysis/hypersonic-strike-and-defense-
conversation-mike-white.
46 See, for example, Rachel S. Cohen, “Hypersonic Attack Cruise Missile Becomes High -Priority USAF Project,” Air
Force Magazine, October 13, 2020, https://www.airforcemag.com/hypersonic-attack-cruise-missile-becomes-
highpriority-usaf-project/.
47 “T actical Boost Glide (T BG) Program Information,” DARPA, https://www.darpa.mil/program/tactical-boost-glide;
and Guy Norris, “U.S. Air Force Plans Road Map to Operational Hypersonics,” Aviation Week, July 27, 2017,
https://aviationweek.com/defense/us-air-force-plans-road-map-operational-hypersonics.
48 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Defense Advanced Research Projects Agency,
Defense-Wide Justification Book 1 of 5, p. 158,
https://comptroller.defense.gov/Portals/45/Documents/defbudget/fy2022/budget_justification/pdfs/03_RDT _and_E/RD
T E_Vol1_DARPA_MasterJustificationBook_PB_2022.pdf .
49 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Defense Advanced Research Projects Agency,
Defense-Wide Justification Book 1 of 5, p. 159,
https://comptroller.defense.gov/Portals/45/Documents/defbudget/fy2022/budget_justification/pdfs/03_RDT _and_E/RD
T E_Vol1_DARPA_MasterJustificationBook_PB_2022.pdf .
50 “Hypersonic Air-breathing Weapon Concept (HAWC) Program Information,” DARPA, https://www.darpa.mil/
program/hypersonic-air-breathing-weapon-concept.
51 “Department of Defense Press Briefing on Hypersonics,” March 2, 2020, https://www.defense.gov/Newsroom/
T ranscripts/T ranscript/Article/2101062/department -of-defense-press-briefing-on-hypersonics/.
52 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Defense Advanced Research Projects Agency,
Defense-Wide Justification Book 1 of 5, p. 161,
https://comptroller.defense.gov/Portals/45/Documents/defbudget/fy2022/budget_justification/pdfs/03_RDT _and_E/RD
T E_Vol1_DARPA_MasterJustificationBook_PB_2022.pdf .
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Table 1. Summary of U.S. Hypersonic Weapons RDT&E Funding
FY2021 Request
FY2021 Enacted
PB2022
Title
($ in millions)
($ in millions)
($ in millions)
Schedule
Conventional
1,008
767
1,374
Platform
Prompt Strike (CPS)
deployment in
FY2025 and FY2028
Long-Range
801
832
301
Prototype
Hypersonic
deployment in
Weapon (LRHW)
FY2023
AGM-183 Air-
382
386
238
Early operational
Launched Rapid
capability in FY2022
Response Weapon
(ARRW)
Hypersonic Attack
0
0
200
Complete critical
Cruise Missile
design review in
(HACM)
FY2023
Tactical Boost Glide
117
82
50
Continue tests in
(TBG)
FY2022
Operational Fires
40
48
45
Complete critical
(OpFires)
design review in
FY2022
Hypersonic Air-
20
31
10
Complete final
breathing Weapon
program review in
Concept (HAWC)
FY2022
Source: Program information taken from U.S. Navy, Army, Air Force, and DARPA FY202 2 Justification Books,
available at https://comptrol er.defense.gov/Budget-Materials/.
Hypersonic Missile Defenses53
DOD is also investing in counter-hypersonic weapons capabilities, although former USD(R&E)
Michael Griffin has stated that the United States wil not have a defensive capability against
hypersonic weapons until the mid-2020s, at the earliest.54 In September 2018, the Missile Defense
Agency (MDA)—which in 2017 established a Hypersonic Defense Program pursuant to Section
1687 of the FY2017 NDAA (P.L. 114-840)—commissioned 21 white papers to explore
hypersonic missile defense options, including interceptor missiles, hypervelocity projectiles, laser
guns, and electronic attack systems.55 In January 2020, MDA issued a draft request for prototype
proposals for a Hypersonic Defense Regional Glide Phase Weapons System interceptor. This
effort is intended to “reduce interceptor key technology and integration risks, anchor modeling
and simulation in areas of large uncertainty, and to increase the interceptor technology readiness
levels (TRL) to level 5” (validating components in a relevant environment).56 MDA has also

53 For additional information about hypersonic missile defense, see CRS In Focus IF11623, Hypersonic Missile
Defense: Issues for Congress, by Kelley M. Sayler, Stephen M. McCall, and Quintin A. Reed.
54 “Media Availability With Deputy Secretary Shanahan and Under Secretary of Defense Griffin at NDIA Hypersonics
Senior Executive Series,” U.S. Department of Defense, December 13, 2018, https://dod.defense.gov/News/T ranscripts/
T ranscript -View/Article/1713396/media-availability-with-deputy-secretary-shanahan-and-under-secretary-of-defens/.
55 P.L. 114-840, Section 2, Division A, T itle XVI, §1687; and Hudson and T rimble, “T op U.S. Hypersonic Weapon
Program”; Steve T rimble, “A Hypersonic Sputnik?,” p. 21.
56 Missile Defense Agency, “Draft Request for Prototype Proposal: Hypersonic Defense Regional Glide Phase Weapon
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awarded four companies—Northrop Grumman, Raytheon, Leidos, and L3Harris—with $20
mil ion contracts to design prototype space-based (low-Earth orbit) sensors by October 31,
2020.57 Such sensors could theoretical y extend the range at which incoming missiles could be
detected and tracked—a critical requirement for hypersonic missile defense, according to then-
USD(R&E) Griffin.58 MDA requested $248 mil ion for hypersonic defense in FY2022—up from
its $207 mil ion FY2021 request and down from the $273 mil ion FY2021 appropriation.59 In
addition, DARPA is working on a program cal ed Glide Breaker, which “wil develop critical
component technology to support a lightweight vehicle designed for precise engagement of
hypersonic threats at very long range.”60 DARPA requested $7 mil ion for Glide Breaker in
FY2022, matching the $7 mil ion appropriation in FY2021.61
Infrastructure
According to a study mandated by the FY2013 National Defense Authorization Act (P.L. 112-
239) and conducted by the Institute for Defense Analyses (IDA),62 the United States had 48
critical hypersonic test facilities and mobile assets in 2014 needed for the maturation of
hypersonic technologies for defense systems development through 2030.63 These specialized
facilities, which simulate the unique conditions experienced in hypersonic flight (e.g., speed,
pressure, heating),64 included 10 DOD hypersonic ground test facilities, 11 DOD open-air ranges,
11 DOD mobile assets, 9 NASA facilities, 2 Department of Energy (DOE) facilities, and 5
industry or academic facilities.65 In its 2014 evaluation of U.S. hypersonic test and evaluation
infrastructure, IDA noted that “no current U.S. facility can provide full-scale, time-dependent,

System,” January 30, 2020, p. 8. T RL measures a technology’s level of maturity; T RL 5 requires validation in a
relevant environment. For information about specific T RLs, see T roy Carter, “ The 9 T echnology Readiness Levels of
the DOD,” T echLink, https://techlinkcenter.org/technology-readiness-level-dod/.
57 Sandra Erwin, “Missile Defense Agency selects four companies to develop space sensors,” Space News, October 30,
2019, https://spacenews.com/missile-defense-agency-selects-four-companies-to-develop-space-sensors/. Experts
disagree on the cost and technological feasibility of space-based missile defense.
58 Media Availability With Deputy Secretary Shanahan and Under Secretary of Defense Griffin.”
59 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Missile Defense Agency, Defense -Wide
Justification Book 2a of 5, p. 569,
https://comptroller.defense.gov/Portals/45/Documents/defbudget/fy2022/budget_justification/pdfs/03_RDT _and_E/RD
T E_Vol2_MDA_RDT E_PB22_Justification_Book.pdf.
60 Department of Defense Fiscal Year (FY) 2021 Budget Estimates, Defense Advanced Research Projects Agency,
Defense-Wide Justification Book 1 of 5, p. 164.
61 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Defense Advanced Research Projects Agency,
Defense-Wide Justification Book 1 of 5, p. 160,
https://comptroller.defense.gov/Portals/45/Documents/defbudget/fy202 2/budget_justification/pdfs/03_RDT _and_E/RD
T E_Vol1_DARPA_MasterJustificationBook_PB_2022.pdf .
62 P.L. 112-239, Section 2, Division A, T itle X, §1071.
63 A more recent report by the Government Accountability Office states that there are “26 DOD, DOE, NASA, and
private U.S. wind tunnel facilities capable of supporting hypersonic research.” Government Accountability Office,
Hypersonic Weapons: DOD Should Clarify Roles and Respon sibilities to Ensure Coordination across Developm ent
Efforts, GAO-21-378, March 22, 2021, p. 15, https://www.gao.gov/products/gao-21-378.
64 T hese conditions additionally require the development of specialized materials such as metals and ceramics.
65 T his list is taken directly from a 2014 Institute for Defense Analysis report and, therefore, may not be current. See
(U//FOUO) Paul F. Piscopo et al., (U) Study on the Ability of the U.S. Test and Evalua tion Infrastructure to Effectively
and Efficiently Mature Hypersonic Technologies for Defense System s Developm ent: Sum mary Analysis and
Assessm ent, Institute for Defense Analyses, September 2014. Permission to use this material has been granted by the
Office of Science and T echnology Policy.
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coupled aerodynamic and thermal-loading environments for flight durations necessary to evaluate
these characteristics above Mach 8.”
Since the 2014 study report was published, there have been a number of changes in U.S.
hypersonic test infrastructure. For example, the University of Notre Dame has opened a Mach 6
hypersonic wind tunnel and at least one hypersonic testing facility has been inactivated.
Development of Mach 8 and Mach 10 wind tunnels at Purdue University and the University of
Notre Dame, respectively, is ongoing.66 In addition, the University of Arizona modified one of its
wind tunnels to enable Mach 5 testing, while Texas A&M University—in partnership with Army
Futures Command—is constructing a kilometer-long Mach 10 wind tunnel.67 (For a partial list of
U.S. hypersonic test assets and their capabilities, see the Appendix.) The United States also uses
the Royal Australian Air Force Woomera Test Range in Australia and the Andøya Rocket Range
in Norway for flight testing.68 In January 2019, the Navy announced plans to reactivate its Launch
Test Complex at China Lake, CA to improve air launch and underwater testing capabilities for the
conventional prompt strike program.69 According to an assessment conducted by the Government
Accountability Office, DOD has dedicated approximately $1 bil ion to hypersonic facility
modernization from FY2015 to FY2024.70
In April 2020, DOD’s Office of Inspector General announced that it would be evaluating current
ground test and evaluation facilities to determine if the capability and capacity would be
sufficient to execute DOD’s planned test schedule.71 Similarly, Section 222 of the FY2021 NDAA
(P.L. 116-283) requires the Under Secretary of Defense for Research and Engineering, in
consultation with the Director of Operational Test and Evaluation, to submit to the congressional
defense committees “an assessment of the sufficiency of the testing capabilities and infrastructure
used for fielding hypersonic weapons, and a description of any investments in testing capabilities
and infrastructure that may be required to support in-flight and ground-based testing for such
weapons.”
In addition, in March 2020, DOD announced that it had established a “hypersonic war room” to
assess the U.S. industrial base for hypersonic weapons and identify “critical nodes” in the supply

66 Oriana Pawlyk, “Air Force Expanding Hypersonic T echnology T esting at T wo Indiana Universities,” Military.com,
April 23, 2019, https://www.military.com/daily-news/2019/04/23/air-force-expanding-hypersonic-technology-testing-
two-indiana-universities.html.
67 University of Arizona, “Mach 5 Quiet Ludwieg T ube,” https://transition.arizona.edu/facilities/qlt5?_ga=
2.62515882.768526379.1582843192 -983632914.1582843192; and Ashley T ressel, “ Army to open hypersonic testing
facility at T exas A&M,” Inside Defense, October 13, 2019, https://insidedefense.com/daily-news/army-open-
hypersonic-testing-facility-texas-am. Additional universities such as the University of Maryland, the California
Institute of T echnology, the Georgia Institute of T echnology, the Air Force Academy, the University of T ennessee, and
Virginia Polytechnic Institute and State University also maintain experimental hypersonic facilities or conduct
hypersonic research.
68 (U//FOUO) Paul F. Piscopo et al., (U) Study on the Ability of the U.S. Test and Evaluation Infrastructure.
69 “Update: US Navy to develop China Lake to support CPS weapon testing,” Jane’s (subscription required), February
12, 2019, https://janes.ihs.com/Janes/Display/FG_1644858-JMR.
70 Government Accountability Office, Hypersonic Weapons: DOD Should Clarify Roles and Responsibilities to Ensure
Coordination across Developm ent Efforts, GAO-21-378, March 22, 2021, p. 27, https://www.gao.gov/products/gao-21-
378.
71 See Department of Defense Office of Inspector General, “Memorandum for Distribution: Evaluation of the Ground
T est and Evaluation Infrastructure Supporting Hypersonic Capabilities (Project No. D2020 -DEV0SN-0106.000),”
April 13, 2020, https://media.defense.gov/2020/Apr/14/2002280826/-1/-1/1/D2020-DEV0SN-0106.000.PDF.
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chain.72 DOD has also amended its “5000 series” acquisition policy in order to enhance supply
chain resiliency and reduce sustainment costs.73
Russia
Although Russia has conducted research on hypersonic weapons technology since the 1980s, it
accelerated its efforts in response to U.S. missile defense deployments in both the United States
and Europe, and in response to the U.S. withdrawal from the Anti-Bal istic Missile Treaty in
2001.74 Detailing Russia’s concerns, President Putin stated that “the US is permitting constant,
uncontrolled growth of the number of anti-bal istic missiles, improving their quality, and creating
new missile launching areas. If we do not do something, eventual y this wil result in the
complete devaluation of Russia’s nuclear potential. Meaning that al of our missiles could simply
be intercepted.”75 Russia thus seeks hypersonic weapons, which can maneuver as they approach
their targets, as an assured means of penetrating U.S. missile defenses and restoring its sense of
strategic stability.76
Programs
Russia is pursuing two hypersonic weapons programs—the Avangard and the 3M22 Tsirkon (or
Zircon)—and has reportedly fielded the Kinzhal (“Dagger”), a maneuvering air-launched bal istic
missile.77
Avangard (Figure 2) is a hypersonic glide vehicle launched from an intercontinental bal istic
missile (ICBM), giving it “effectively ‘unlimited’ range.”78 Reports indicate that Avangard is
currently deployed on the SS-19 Stiletto ICBM, though Russia plans to eventual y launch the
vehicle from the Sarmat ICBM. Sarmat is stil in development, although it is scheduled to be
deployed by the end of 2022.79 Avangard features onboard countermeasures and wil reportedly

72 Aaron Mehta, “Pentagon launches hypersonic industrial base study,” Defense News, March 3, 2020,
https://www.defensenews.com/pentagon/2020/03/02/pentagon-launches-hypersonic-industrial-base-study/.
73 C. T odd Lopez, “Rewrite of Acquisition Regulation Helps U.S. Build Hyp ersonic Arsenal More Quickly,” DOD
News, October 30, 2020, https://www.defense.gov/Explore/News/Article/Article/2400205/rewrite-of-acquisition-
regulation-helps-us-build-hypersonic-arsenal-more-quickly/.
74 United Nations Office of Disarmament Affairs, Hypersonic Weapons: A Challenge and Opportunity for Strategic
Arm s Control, February 2019, https://www.un.org/disarmament/publications/more/hypersonic-weapons-a-challenge-
and-opportunity-for-strategic-arms-control/.
75 Vladimir Putin, “Presidential Address to the Federal Assembly,” March 1, 2018, http://en.kremlin.ru/events/
president/news/56957.
76 In this instance, “strategic stability” refers to a “bilateral nuclear relationship of mutual vulnerability.” See T ong
Zhao, “Conventional Challenges to Strategic Stability: Chinese Perceptions of Hypersonic T echnology and the Security
Dilemma,” Carnegie-T singhua Center for Global Policy, July 23, 2018, https://carnegietsinghua.org/2018/07/23/
conventional-challenges-to-strategic-stability-chinese-perceptions-of-hypersonic-technology-and-security-dilemma-
pub-76894.
77 Although the Kinzhal is a maneuvering air-launched ballistic missile rather than a hypersonic glide vehicle or
hypersonic cruise missile, it is often included in reporting of Russia’s hypersonic weapons program. For this reason —
and because it poses defensive challenges that are similar to other hypersonic weapons—it is included here for
reference.
78 Steve T rimble, “A Hypersonic Sputnik?,” Aviation Week, January 14-27, 2019, p. 20.
79 Nicholas Fiorenza, “Putin outlines development of Russia’s nuclear triad,” Jane’s Defence Weekly (subscription
required), April 22, 2021, https://customer.janes.com/DefenceWeekly/Display/FG_3953700-JDW. Sarmat could
reportedly accommodate at least three Avangard vehicles. See Malcolm Claus, “Russia unveils new strategic delivery
systems,” Jane’s (subscription required), https://janes.ihs.com/Janes/Display/FG_899127-JIR.
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carry a nuclear warhead. It was successfully tested twice in 2016 and once in December 2018,
reportedly reaching speeds of Mach 20; however, an October 2017 test resulted in failure.
Russian news sources claim that Avangard entered into combat duty in December 2019.80
Figure 2. Artist Rendering of Avangard

Source: https://janes.ihs.com/Janes/Display/FG_899127-JIR.
In addition to Avangard, Russia is developing Tsirkon, a ship-launched hypersonic cruise missile
capable of traveling at speeds of between Mach 6 and Mach 8. Tsirkon is reportedly capable of
striking both ground and naval targets. According to Russian news sources, Tsirkon has a range of
between approximately 250 and 600 miles and can be fired from the vertical launch systems
mounted on cruisers Admiral Nakhimov and Pyotr Veliky, Project 20380 corvettes, Project 22350
frigates, and Project 885 Yasen-class submarines, among other platforms.81 These sources assert
that Tsirkon was successfully launched from a Project 22350 frigate in January and October
2020.82 U.S. intel igence reports indicate that the missile wil become operational in 2023.83
In addition, Russia has reportedly fielded Kinzhal, a maneuvering air-launched bal istic missile
modified from the Iskander missile. According to U.S. intel igence reports, Kinzhal was
successfully test fired from a modified MiG-31 fighter (NATO code name: Foxhound) in July
2018—striking a target at a distance of approximately 500 miles—and may now be ready for
combat.84 Russia plans to deploy the missile on both the MiG-31 and the Su-34 long-range strike

80 “First regiment of Avangard hypersonic missile systems goes on combat duty in Russia,” TASS, December 27, 2019,
https://tass.com/defense/1104297.
81 “Russia makes over 10 test launches of T sirkon seaborne hypersonic missile,” TASS, December 21, 2018,
http://tass.com/defense/1037426. See also Russia Military Power: Building a Military to Support Great Power
Aspirations, Defense Intelligence Agency, 2017, p. 79, https://www.dia.mil/portals/27/documents/news/
military%20power%20publications/russia%20military%20power%20report%202017.pdf.
82 “T ASS: Russia Conducts First Ship-Based Hypersonic Missile T est,” Reuters, February 27, 2020,
https://www.voanews.com/europe/tass-russia-conducts-first-ship-based-hypersonic-missile-test; and Associated Press,
“Russia reports successful test launch of hypersonic missile,” October 7, 2020, https://apnews.com/article/vladimir-
putin-archive-russia-20688205e30f19a8d76fcd77cb9d45a4.
83 Amanda Macias, “Russia again successfully tests ship-based hypersonic missile—which will likely be ready for
combat by 2022,” CNBC, December 20, 2018, https://www.cnbc.com/2018/12/20/russia-tests-hypersonic-missile-that-
could-be-ready-for-war-by-2022.html; and “ Russian Navy to accept latest T sirkon hypersonic missile for service in
2023—source,” TASS, March 20, 2019, http://tass.com/defense/1049572.
84 Amanda Macias, “Russia’s new hypersonic missile, which can be launched from warplanes, will likely be ready for
combat by 2020,” CNBC, July 13, 2018, https://www.cnbc.com/2018/07/13/russia-new-hypersonic-missile-likely-
ready-for-war-by-2020.html.
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fighter.85 Russia is working to mount the missile on the Tu-22M3 strategic bomber (NATO code
name: Backfire), although the slower-moving bomber may face chal enges in “accelerating the
weapon into the correct launch parameters.”86
Russian media has reported Kinzhal’s top speed as Mach 10, with a range of up to 1,200 miles
when launched from the MiG-31. The Kinzhal is reportedly capable of maneuverable flight, as
wel as of striking both ground and naval targets, and could eventual y be fitted with a nuclear
warhead. However, such claims regarding Kinzhal’s performance characteristics have not been
publicly verified by U.S. intel igence agencies, and have been met with skepticism by a number
of analysts.87
Infrastructure
Russia reportedly conducts hypersonic wind tunnel testing at the Central Aero-Hydrodynamic
Institute in Zhukovsky and the Khristianovich Institute of Theoretical and Applied Mechanics in
Novosibirsk, and has tested hypersonic weapons at Dombarovskiy Air Base, the Baykonur
Cosmodrome, and the Kura Range.88
China
According to Tong Zhao, a fel ow at the Carnegie-Tsinghua Center for Global Policy, “most
experts argue that the most important reason to prioritize hypersonic technology development [in
China] is the necessity to counter specific security threats from increasingly sophisticated U.S.
military technology,” such as U.S. missile defenses.89 In particular, China’s pursuit of hypersonic
weapons, like Russia’s, reflects a concern that U.S. hypersonic weapons could enable the United
States to conduct a preemptive, decapitating strike on China’s nuclear arsenal and supporting
infrastructure. U.S. missile defense deployments could then limit China’s ability to conduct a
retaliatory strike against the United States.90
As General Terrence O’Shaughnessy, then-commander of United States Northern Command
(USNORTHCOM) and North American Aerospace Defense Command (NORAD), testified in a
February 2020 hearing before the Senate Armed Services Committee, China is “testing a
[nuclear-capable] intercontinental-range hypersonic glide vehicle” that could evade U.S. missile

85 Mark B. Schneider, “Moscow’s Development of Hypersonic Missiles … and What It Means” in Defense Technology
Program Brief: Hypersonic Weapons, American Foreign Policy Council, May 17, 2019.
86 Dave Majumdar, “Russia: New Kinzhal Aero-Ballistic Missile Has 3,000 km Range if Fired from Supersonic
Bomber,” The National Interest, July 18, 2018, https://nationalinterest.org/blog/buzz/russia-new-kinzhal-aero-ballistic-
missile-has-3000-km-range-if-fired-supersonic-bomber.
87 David Axe, “Is Kinzhal, Russia’s New Hypersonic Missile, a Game Changer?,” The Daily Beast, March 15, 2018,
https://www.thedailybeast.com/is-kinzhal-russias-new-hypersonic-missile-a-game-changer.
88 “Aerodynamics,” Central Aerohydrodynamic Institute, http://tsagi.com/research/aerodynamics/; “Russia announces
successful flight test of Avangard hypersonic glide vehicle,” Jane’s (subscription required), January 3, 2019,
https://janes.ihs.com/Janes/Display/FG_1451630-JMR; and “ Avangard system is tested, said to be fully ready for
deployment,” Russian Strategic Nuclear Forces, December 26, 2018, http://russianforces.org/blog/2018/12/
avangard_system_is_tested_said.shtml.
89 T ong Zhao, “Conventional Challenges to Strategic Stability: Chinese Perceptions of Hypersonic T echnology and the
Security Dilemma.”
90 T ong Zhao, “Conventional Challenges to Strategic Stability”; and Lora Saalman, “China’s Calc ulus on Hypersonic
Glide,” August 15, 2017, Stockholm International Peace Research Institute, https://www.sipri.org/commentary/topical-
backgrounder/2017/chinas-calculus-hypersonic-glide.
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defense and warning systems.91 Reports additional y indicate that China may have tested a
nuclear-capable HGV92—launched by a Long March rocket—in August 2021.93 In contrast to the
bal istic missiles that China has previously used to launch HGVs, the Long March, a fractional
orbital bombardment system (FOBS), launches the HGV into orbit before the HGV de-orbits to
its target. This could provide China with a space-based global strike capability and further reduce
the amount of target warning time prior to a strike.94
China has also demonstrated a growing interest in Russian advances in hypersonic weapons
technology, conducting flight tests of a hypersonic-glide vehicle (HGV) only days after Russia
tested its own system.95 Furthermore, a January 2017 report found that over half of open-source
Chinese papers on hypersonic weapons include references to Russian weapons programs.96 This
could indicate that China is increasingly considering hypersonic weapons within a regional
context. Indeed, some analysts believe that China may be planning to mate conventional y armed
HGVs with the DF-21 and DF-26 bal istic missiles in support of an anti-access/area denial
strategy.97
Programs
China has conducted a number of successful tests of the DF-17, a medium-range bal istic missile
specifical y designed to launch HGVs. U.S. intel igence analysts assess that the missile has a
range of approximately 1,000 to 1,500 miles and may now be deployed.98 China has also tested
the DF-41 intercontinental bal istic missile, which could be modified to carry a conventional or
nuclear HGV, according to a report by a U.S. Congressional commission. The development of the
DF-41 thus “significantly increases the [Chinese] rocket force’s nuclear threat to the U.S.
mainland,” the report states.99

91 General T errence J. O’Shaughnessy, “Statement before the Senate Armed Services Committee,” February 13, 2020,
https://www.armed-services.senate.gov/hearings/20-02-13-united-states-northern-command-and-united-states-strategic-
command.
92 It is not clear if this nuclear-capable HGV is the same model as that referenced by General O’Shaughnessy.
93 Demetri Sevastopulo and Kathrin Hille, “China tests new space capability with hypersonic missile,” October 16,
2021, https://www.ft.com/content/ba0a3cde-719b-4040-93cb-a486e1f843fb. China’s Foreign Ministry Spokesperson
Zhao Lijian has stated that “ this was a routine test of [a] space vehicle,” rather than a test of a nuclear-capable HGV.
Zhao Lijian, “ Remarks at Regular Press Conference,” Ministry of Foreign Affairs of the People’s Republic of China,
October 18, 2021, https://www.fmprc.gov.cn/mfa_eng/xwfw_665399/s2510_665401/t1915130.shtml.
94 Greg Hadley, “ Kendall: China Has Potential to Strike Earth From Space,” Air Force Magazine, September 20, 2021,
https://www.airforcemag.com/global-strikes-space-china-frank-kendall/.
95 Lora Saalman, “China’s Calculus on Hypersonic Glide.”
96 Lora Saalman, “Factoring Russia into the US-China Equation on Hypersonic Glide Vehicles,” SIPRI, January 2017,
https://www.sipri.org/sites/default/files/Factoring-Russia-into-US-Chinese-equation-hypersonic-glide-vehicles.pdf.
97 Lora Saalman, “China’s Calculus on Hypersonic Glide”; and Malcolm Claus and Andrew T ate, “Chinese hypersonic
programme reflects regional priorities,” Jane’s (subscription required), March 12, 2019, https://janes.ihs.com/Janes/
Display/FG_1731069-JIR.
98 Ankit Panda, “Introducing the DF-17: China’s Newly T ested Ballistic Missile Armed with a Hypersonic Glide
Vehicle,” The National Interest, December 28, 2017, https://thediplomat.com/2017/12/introducing-the-df-17-chinas-
newly-tested-ballistic-missile-armed-with-a-hypersonic-glide-vehicle/; and Bill Gertz, “ China’s new hypersonic
missile,” Washington Tim es, October 2, 2019, https://www.washingtontimes.com/news/2019/oct/2/china-shows-df-17-
hypersonic-missile/.
99 U.S.-China Economic and Security Review Commission 2018 Annual Report, p. 235, https://www.uscc.gov/sites/
default/files/annual_reports/2018%20Annual%20Report%20to%20Congress.pdf.
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China has tested the DF-ZF HGV (previously referred to as the WU-14) at least nine times since
2014. U.S. defense officials have reportedly identified the range of the DF-ZF as approximately
1,200 miles and have stated that the vehicle may be capable of performing “extreme maneuvers”
during flight.100 Although unconfirmed by intel igence agencies, some analysts believe the DF-ZF
could have become operational as early as 2020.101
According to U.S. defense officials, China also successfully tested Starry Sky-2 (or Xing Kong-
2), a nuclear-capable hypersonic vehicle prototype, in August 2018.102 China claims the vehicle
reached top speeds of Mach 6 and executed a series of in-flight maneuvers before landing.103
Unlike the DF-ZF, Starry Sky-2 is a “waverider” that uses powered flight after launch and derives
lift from its own shockwaves. Some reports indicate that the Starry Sky-2 could be operational by
2025.104 U.S. officials have declined to comment on the program.105
Infrastructure
China has a robust research and development infrastructure devoted to hypersonic weapons.
Then-USD(R&E) Michael Griffin stated in March 2018 that China has conducted 20 times as
many hypersonic tests as the United States.106 China tested three hypersonic vehicle models
(D18-1S, D18-2S, and D18-3S)—each with different aerodynamic properties—in September
2018.107 Analysts believe that these tests could be designed to help China develop weapons that
fly at variable speeds, including hypersonic speeds. Similarly, China has used the Lingyun Mach
6+ high-speed engine, or “scramjet,” test bed (Figure 3) to research thermal resistant components
and hypersonic cruise missile technologies.108

100 “Gliding missiles that fly faster than Mach 5 are coming,” The Economist, April 6, 2019,
https://www.economist.com/science-and-technology/2019/04/06/gliding-missiles-that -fly-faster-than-mach-5-are-
coming; and Franz-Stefan Gady, “ China T ests New Weapon Capable of Breaching US Missile Defense Systems,” The
Diplom at, April 28, 2016, https://thediplomat.com/2016/04/china-tests-new-weapon-capable-of-breaching-u-s-missile-
defense-systems/.
101 U.S.-China Economic and Security Review Commission 2015 Annual Report, p. 20, https://www.uscc.gov/sites/
default/files/annual_reports/2015%20Annual%20Report%20to%20Congress.PDF.
102 Office of the Secretary of Defense, Annual Report to Congress: Military and Security Developments Involving the
People’s Republic of China 2019, May 2, 2019, p. 44, https://media.defense.gov/2019/May/02/2002127082/-1/-1/1/
2019_CHINA_MILIT ARY_POW ER_REPORT.pdf.
103 Jessie Yeung, “China claims to have successfully tested its first hypersonic aircraft, CNN, August 7, 2018,
https://www.cnn.com/2018/08/07/china/china-hypersonic-aircraft -intl/index.html.
104 U.S.-China Economic and Security Review Commission Report 2015, p. 20.
105 Bill Gertz, “China Reveals T est of New Hypersonic Missile,” The Washington Free Beacon, August 10, 2018,
https://freebeacon.com/national-security/chinas-reveals-test-new-hypersonic-missile/.
106 U.S.-China Economic and Security Review Commission Report 2015 , p. 20.
107 Malcolm Claus and Andrew T ate, “Chinese hypersonic programme reflects regional priorities,” Jane’s (subscription
required), March 12, 2019, https://janes.ihs.com/Janes/Display/FG_1731069-JIR.
108 Jeffrey Lin and P.W. Singer, “China’s hypersonic military projects include spaceplanes and rail guns,” Popular
Mechanics, June 26, 2018, https://www.popsci.com/chinas-hypersonic-work-speeds-up.
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Figure 3. Lingyun-1 Hypersonic Cruise Missile Prototype

Source: Photo accompanying Drake Long, “China reveals Lingyun-1 hypersonic missile at National Science and
Technology expo,” The Defense Post, May 21, 2018.
According to Jane’s Defence Weekly, “China is also investing heavily in hypersonic ground
testing facilities.”109 For example, the China Aerodynamics Research and Development Center
claims to have 18 wind tunnels, while the China Academy of Aerospace Aerodynamics is known
to operate at least three hypersonic wind tunnels—the FD-02, FD-03, and FD-07—capable of
reaching speeds of Mach 8, Mach 10, and Mach 12, respectively.110 China also operates the JF-12
hypersonic wind tunnel, which reaches speeds of between Mach 5 and Mach 9 and the FD-21
hypersonic wind tunnel, which reaches speeds of between Mach 10 and Mach 15.111 It wil
reportedly complete construction of the JF-22 wind tunnel, capable of reaching speeds of Mach
30, in 2022.112 In addition, China is known to have tested hypersonic weapons at the Jiuquan
Satel ite Launch Center and the Taiyuan Satel ite Launch Center.

109 Andrew T ate, “China conducts further tests with hypersonic vehicles,” Jane’s Defence Weekly (subscription
required), October 2, 2018, https://customer.janes.com/DefenceWeekly/Display/FG_1120806-JDW.
110 Kelvin Wong, “China claims successful test of hypersonic waverider,” Jane’s (subscription required), August 10,
2018, https://janes.ihs.com/Janes/Display/FG_1002295-JDW; and Ellen Nakashima and Gerry Shih, “ China builds
advanced weapons systems using American chip technology,” Washington Post, April 9, 2021.
111 Jeffrey Lin and P.W. Singer, “A look at China’s most exciting hypersonic aerospace programs,” Popular Science,
April 18, 2017, https://www.popsci.com/chinas-hypersonic-technology.
112 Andrew T ate, “ China’s new hypersonic wind tunnel expected to be ready next year,” Janes Defence Weekly
(subscription required), August 24, 2021, https://www.janes.com/defence-news/news-detail/chinas-new-hypersonic-
wind-tunnel-expected-to-be-ready-next-year.
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Global Hypersonic Weapons Programs
Although the United States, Russia, and China possess the most advanced hypersonic weapons programs, a
number of other countries—including Australia, India, France, Germany, and Japan—are also developing
hypersonic weapons technology. Since 2007, the United States has col aborated with Australia on the Hypersonic
International Flight Research Experimentation (HIFiRE) program to develop hypersonic technologies. The most
recent HIFiRE test, successful y conducted in July 2017, explored the flight dynamics of a Mach 8 hypersonic glide
vehicle, while previous tests explored scramjet engine technologies. HIFiRE’s successor, the Southern Cross
Integrated Flight Research Experiment (SCIFiRE) program, is to further develop hypersonic air-breathing
technologies. SCIFiRE demonstration tests are expected by the mid-2020s. In addition to the Woomera Test
Range facilities—one of the largest weapons test facilities in the world—Australia reportedly operates seven
hypersonic wind tunnels and is capable of testing speeds of up to Mach 30.
India has similarly col aborated with Russia on the development of BrahMos II, a Mach 7 hypersonic cruise missile.
Although BrahMos II was initial y intended to be fielded in 2017, news reports indicate that the program faces
significant delays and is now scheduled to achieve initial operational capability between 2025 and 2028. Reportedly,
India is also developing an indigenous, dual-capable hypersonic cruise missile as part of its Hypersonic Technology
Demonstrator Vehicle program and successful y tested a Mach 6 scramjet in June 2019 and September 2020. India
operates approximately 12 hypersonic wind tunnels and is capable of testing speeds of up to Mach 13.
France also has col aborated and contracted with Russia on the development of hypersonic technology. Although
France has been investing in hypersonic technology research since the 1990s, it has only recently announced its
intent to weaponize the technology. Under the V-max (Experimental Maneuvering Vehicle) program, France plans
to modify its air-to-surface ASN4G supersonic missile for hypersonic flight by 2022. Some analysts believe that the
V-max program is intended to provide France with a strategic nuclear weapon. France operates five hypersonic
wind tunnels and is capable of testing speeds of up to Mach 21.
Germany successful y tested an experimental hypersonic glide vehicle (SHEFEX II) in 2012; however, reports
indicate that Germany may have pul ed funding for the program. German defense contractor DLR continues to
research and test hypersonic vehicles as part of the European Union’s ATLLAS II project, which seeks to design a
Mach 5-6 vehicle. Germany operates three hypersonic wind tunnels and is capable of testing speeds of up to
Mach 11.
Final y, Japan is developing the Hypersonic Cruise Missile (HCM) and the Hyper Velocity Gliding Projectile
(HVGP). According to Jane’s, Japan invested $122 mil ion in HVGP in FY2019. It reportedly plans to field HVGPs
for area suppression and neutralizing aircraft carriers. HVGP is expected to enter service in 2026, with a more
advanced version available by 2030, while HCM is expected to enter service in 2030. The Japan Aerospace
Exploration Agency operates three hypersonic wind tunnels, with two additional facilities at Mitsubishi Heavy
Industries and the University of Tokyo.
Other countries—including Iran, Israel, and South Korea—have conducted foundational research on hypersonic
airflows and propulsion systems, but may not be pursuing a hypersonic weapons capability at this time.
Note: For additional information about global hypersonic weapons programs, see Richard H. Speier et al., Hypersonic
Missile Proliferation. For information about Japan’s hypersonic weapons research and development plans, see Mike Yeo,
“Japan unveils its hypersonic weapons plans,” Defense News, March 14, 2020.

Issues for Congress
As Congress reviews the Pentagon’s plans for U.S. hypersonic weapons programs during the
annual authorization and appropriations process, it might consider a number of questions about
the rationale for hypersonic weapons, their expected costs, and their implications for strategic
stability and arms control. This section provides an overview of some of these questions.
Mission Requirements
Although the Department of Defense is funding a number of hypersonic weapons programs, it has
not established any programs of record, suggesting that it may not have approved requirements
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for hypersonic weapons or long-term funding plans.113 Indeed, as Principal Director for
Hypersonics (USD[R&E]) Mike White has stated, DOD has not yet made a decision to acquire
hypersonic weapons and is instead developing prototypes to “[identify] the most viable
overarching weapon system concepts to choose from and then make a decision based on success
and chal enges.”114
As Congress conducts oversight of U.S. hypersonic weapons programs, it may seek to obtain
information about DOD’s evaluation of potential mission sets for hypersonic weapons, a cost
analysis of alternative means of executing these mission sets, and an assessment of the enabling
technologies—such as space-based sensors or autonomous command and control systems—that
may be required to employ or defend against hypersonic weapons. For example, Section 1671 of
the FY2021 NDAA (P.L. 116-283) directs the Chairman of the Joint Chiefs of Staff, in
coordination with the Under Secretary of Defense for Policy, to submit to the congressional
defense committees a report on strategic hypersonic weapons, including “a description of how the
requirements for land and sea-based hypersonic weapons wil be addressed with the Joint
Requirements Oversight Council, and how such requirements wil be formal y provided to the
military departments procuring such weapons.” This report is to additional y include “the
potential target sets for hypersonic weapons ... and the required mission planning to support
targeting by the United States Strategic Command and other combatant commands.”
Funding and Management Considerations
Principal Director for Hypersonics (USD[R&E]) Mike White has noted that DOD is prioritizing
offensive programs while it determines “the path forward to get a robust defensive strategy.”115
This approach is reflected in DOD’s recent budget requests. For example, DOD requested $247.9
mil ion for hypersonic defense programs and $3.8 bil ion for hypersonic weapons programs in
FY2022.116 Similarly, in FY2021, DOD requested $206.8 mil ion for hypersonic defense
programs and $3.2 bil ion for hypersonic weapons programs.117
Although the Defense Subcommittees of the Appropriations Committees increased FY2020
appropriations for both hypersonic offense and defense above the FY2020 request, they expressed
concerns, noting in their joint explanatory statement of H.R. 1158 “that the rapid growth in
hypersonic research has the potential to result in stove-piped, proprietary systems that duplicate
capabilities and increase costs.”118 To mitigate this concern, they appropriated $100 mil ion for
DOD to establish a Joint Hypersonics Transition Office (JHTO) to “develop and implement an

113 Steve T rimble, “New Long-T erm Pentagon Plan Boosts Hypersonics.”
114 Steve T rimble, “New Long-T erm Pentagon Plan Boosts Hypersonics.”
115 Aaron Mehta, “Is the Pentagon Moving Quickly Enough on Hypersonic Defense?” Defense News, March 21, 2019,
https://www.defensenews.com/pentagon/2019/03/21/is-the-pentagon-moving-quickly-enough-on-hypersonic-defense/.
116 Department of Defense Fiscal Year (FY) 2022 Budget Estimates, Missile Defense Agency Defense -Wide
Justification Book Volume 2a of 5, p. 569,
https://comptroller.defense.gov/Portals/45/Documents/defbudget/fy2022/budget_justification/pdfs/03_RDT _and_E/RD
T E_Vol2_MDA_RDT E_PB22_Justification_Book.pdf.
117 Department of Defense Fiscal Year (FY) 2021 Budget Estimates, Missile Defense Agency Defense -Wide
Justification Book Volume 2a of 5, p. 10, https://comptroller.defense.gov/Portals/45/Documents/defbudget/fy2021/
budget_justification/pdfs/03_RDT _and_E/RDT E_Vol2_MDA_RDT E_PB21_Justification_Book.pdf .
118 “Department of Defense Appropriations Act, 2020: Joint Explanatory Statement,” Defense Subcommittees of the
Appropriations Committees, December 16, 2019, https://appropriations.house.gov/sites/
democrats.appropriations.house.gov/files/HR%201158%20-%20Division%20A%20-
%20Defense%20SOM%20FY20.pdf.
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integrated science and technology roadmap for hypersonics” and “establish a university
consortium for hypersonic research and workforce development” in support of DOD efforts.119
DOD established the JHTO in April 2020 and announced on October 26, 2020, that it awarded
Texas A&M University with a $20 mil ion contract—renewable for up to $100 mil ion—to
manage a University Consortium for Applied Hypersonics (UCAH).120 UCAH is to be overseen
by a group of academic researchers from Texas A&M University, the Massachusetts Institute of
Technology, the University of Minnesota, the University of Il inois at Urbana-Champaign, the
University of Arizona, the University of Tennessee Space Institute, Morgan State University, the
California Institute of Technology, Purdue University, the University of California-Los Angeles,
and the Georgia Institute of Technology.121 The consortium is to “facilitate transitioning academic
research into developing systems [as wel as] work with the department to reduce system
development timelines while maintaining quality control standards.”122
In addition, Section 1671 of the FY2021 NDAA (P.L. 116-283) directs the Secretary of the Army
and the Secretary of the Navy to jointly submit to the congressional defense committees a report
on LRHW and CPS, including total costs of the programs, “the strategy for such programs with
respect to manning, training, and equipping, including cost estimates, [and] a testing strategy and
schedule for such programs.” It directs the Director of Cost Assessment and Program Evaluation
to submit to the congressional defense committees an independent cost estimate of these
programs.123
Given the lack of defined mission requirements for hypersonic weapons, however, it may be
chal enging for Congress to evaluate the balance of funding for hypersonic weapons programs,
enabling technologies, supporting test infrastructure, and hypersonic missile defense.
Strategic Stability
Analysts disagree about the strategic implications of hypersonic weapons. Some have identified
two factors that could hold significant implications for strategic stability: the weapon’s short
time-of-flight—which, in turn, compresses the timeline for response—and its unpredictable flight
path—which could generate uncertainty about the weapon’s intended target and therefore
heighten the risk of miscalculation or unintended escalation in the event of a conflict. This risk
could be further compounded in countries that co-locate nuclear and conventional capabilities or
facilities.

119 Ibid. T he Joint Hypersonic T ransition Office, then called the Joint T echnology Office on Hypersonics, was
originally mandated by Section 218 of the FY2007 NDAA ( P.L. 109-364). The office was redesignated as the Joint
Hypersonics T ransition Office and given additional authorities in Section 214 of the FY2018 NDAA ( P.L. 115-91).
Section 216 of the FY2020 NDAA (P.L. 116-92) further amended the office’s authorities to include the ability to enter
into agreements with institutions of higher learning. T he office went unfunded until FY2020 and was not established
until April 2020.
120 David Vergun, “DOD Awards Applied Hypersonics Contract to T exas A&M University,” DOD News, October 26,
2020, https://www.defense.gov/Explore/News/Article/Article/2394438/dod-awards-applied-hypersonics-contract-to-
texas-am-university/.
121 Ibid.
122 Ibid.
123 T he Government Accountability Office notes DOD’s difficulty in developing accurate cost estimates f or hypersonic
weapons programs. For example, between FY2019 and FY2020, estimates for CPS “almost doubled.” Government
Accountability Office, Hypersonic Weapons: DOD Should Clarify Roles and Responsibilities to Ensure Coordination
across Developm ent Efforts, GAO-21-378, March 22, 2021, p. 21, https://www.gao.gov/products/gao-21-378.
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Some analysts argue that unintended escalation could occur as a result of warhead ambiguity, or
from the inability to distinguish between a conventional y armed hypersonic weapon and a
nuclear-armed one. However, as a United Nations report notes, “even if a State did know that an
HGV launched toward it was conventional y armed, it may stil view such a weapon as strategic
in nature, regardless of how it was perceived by the State firing the weapon, and decide that a
strategic response was warranted.”124 Differences in threat perception and escalation ladders
could thus result in unintended escalation. Such concerns have previously led Congress to restrict
funding for conventional prompt strike programs.125
Other analysts have argued that the strategic implications of hypersonic weapons are minimal.
Pavel Podvig, a senior research fel ow at the United Nations Institute for Disarmament Research,
has noted that the weapons “don’t … change much in terms of strategic balance and military
capability.”126 This, some analysts argue, is because U.S. competitors such as China and Russia
already possess the ability to strike the United States with intercontinental bal istic missiles,
which, when launched in salvos, could overwhelm U.S. missile defenses.127 Furthermore, these
analysts note that in the case of hypersonic weapons, traditional principles of deterrence hold: “it
is real y a stretch to try to imagine any regime in the world that would be so suicidal that it would
even think threating to use—not to mention to actual y use—hypersonic weapons against the
United States ... would end wel .”128
Section 1671 of the FY2021 NDAA (P.L. 116-283) directs the Chairman of the Joint Chiefs of
Staff, in coordination with the Under Secretary of Defense for Policy, to submit to the
congressional defense committees a report that examines
How escalation risks will be addressed with regards to the use of strategic hypersonic
weapons, including whether any risk escalation exercises have been conduct ed or are
planned for the potential use of hypersonic weapons, and an analysis of the escalation risks
posed by foreign hypersonic systems that are potentially nuclear and conventional dual-
use capable weapons.
Arms Control
Some analysts who believe that hypersonic weapons could present a threat to strategic stability or
inspire an arms race have argued that the United States should take measures to mitigate risks or
limit the weapons’ proliferation. Proposed measures include expanding New START, negotiating
new multilateral arms control agreements, and undertaking transparency and confidence-building
measures.129

124 United Nations Office of Disarmament Affairs, Hypersonic Weapons.
125 For a history of legislative activity on convent ional prompt global strike, see CRS Report R41464, Conventional
Prom pt Global Strike and Long-Range Ballistic Missiles: Background and Issues, by Amy F. Woolf.
126 Amy Mackinnon, “Russia’s New Missiles Are Aimed at the U.S.,” Foreign Policy, March 5, 2019,
https://foreignpolicy.com/2019/03/05/russias-new-missiles-are-aimed-at-you-weapons-hypersonic-putin-united-states-
inf/.
127 David Axe, “How the U.S. Is Quietly Winning the Hypersonic Arms Race,” The Daily Beast, January 16, 2019,
https://www.thedailybeast.com/how-the-us-is-quietly-winning-the-hypersonic-arms-race. See also Mark B. Schneider,
“Moscow’s Development of Hypersonic Missiles,” p. 14.
128 Jyri Raitasalo, “Hypersonic Weapons are No Game-Changer,” The National Interest, January 5, 2019,
https://nationalinterest.org/blog/buzz/hypersonic-weapons-are-no-game-changer-40632.
129 See United Nations Office of Disarmament Affairs, Hypersonic Weapon; and Richard H. Speier et al., Hypersonic
Missile Proliferation.
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The New START Treaty, a strategic offensive arms treaty between the United States and Russia,
does not currently cover weapons that fly on a bal istic trajectory for less than 50% of their flight,
as do hypersonic glide vehicles and hypersonic cruise missiles.130 However, Article V of the treaty
states that “when a Party believes that a new kind of strategic offensive arm is emerging, that
Party shal have the right to raise the question of such a strategic offensive arm for consideration
in the Bilateral Consultative Commission (BCC).” Accordingly, some legal experts hold that the
United States could raise the issue in the BCC of negotiating to include hypersonic weapons in
the New START limits.131 However, because New START is due to expire in 2026, this may be a
short-term solution.132
As an alternative, some analysts have proposed negotiating a new international arms control
agreement that would institute a moratorium or ban on hypersonic weapon testing. These analysts
argue that a test ban would be a “highly verifiable” and “highly effective” means of preventing a
potential arms race and preserving strategic stability.133 Other analysts have countered that a test
ban would be infeasible, as “no clear technical distinction can be made between hypersonic
missiles and other conventional capabilities that are less prompt, have shorter ranges, and also
have the potential to undermine nuclear deterrence.”134 These analysts have instead proposed
international transparency and confidence-building measures, such as exchanging weapons data;
conducting joint technical studies; “providing advance notices of tests; choosing separate,
distinctive launch locations for tests of hypersonic missiles; and placing restraints on sea-based
tests.”135

130 In some cases, hypersonic glide vehicles may be launched from intercontinental ballistic missiles that are already
covered by New ST ART , as is reported to be the case with Russia’s Avangard HGV. See Rachel S. Cohen,
“Hypersonic Weapons: Strategic Asset or T actical T ool?”
131 James Acton notes: “during [New ST ART ] negotiations, Russia argued that boost-glide weapons might constitute ‘a
new kind of strategic offensive arm,’ in which case they would trigger bilateral discussions about whether and how
they would be regulated by the treaty—a position [then] rejected by the United States.” James M. Acton, Silver Bullet?:
Asking the Right Questions about Conventional Prom pt Global Strike, Carnegie Endowment for International Peace,
2013, p. 139, https://carnegieendowment.org/files/cpgs.pdf.
132 CRS Report R41219, The New START Treaty: Central Limits and Key Provisions, by Amy F. Woolf.
133 Mark Gubrud, “T est Ban for Hypersonic Missiles?” Bulletin of the Atomic Scientists, August 6 , 2015,
https://thebulletin.org/roundtable/test-ban-for-hypersonic-missiles/.
134 T ong Zhao, “T est Ban for Hypersonic Missiles?”
135 Rajaram Nagappa, “T est Ban for Hypersonic Missiles?”; see also James M. Acton, Silver Bullet?, pp. 134-138.
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Appendix. U.S. Hypersonic Testing Infrastructure136
Table A-1. DOD Hypersonic Ground Test Facilities
Facility
Capability
Location
Air Force Arnold Engineering and
Tunnel A: 40-inch Mach 1.5-5.5; up
Arnold AFB, TN
Development Complex (AEDC) von
to 290 °F
Karman Gas Dynamics Facility
Tunnel B: 50-inch Mach 6 and 8; up
Tunnels A/B/C
to 900 °F
Tunnel C: 50-inch Mach 10; up to
1700 °F
Air Force AEDC High-Enthalpy
Simulate thermal and pressure
Arnold AFB, TN
Aerothermal Test Arc-Heated
environments at speeds of up to
Facilities H1, H2, H3
Mach 8
Air Force AEDC Tunnel 9
59-inch Mach 7, 8,10, 14, and18; up White Oak, MD
to 2900 °F
Air Force AEDC Aerodynamic and
Mach 3.1-7.2; up to 1300 °F
Arnold AFB, TN
Propulsion Test Unit
Air Force AEDC Aerobal istic Range
Launches projectiles of up to 8
Arnold AFB, TN
G
inches in diameter at speeds of up
to Mach 20
Hol oman High Speed Test Track
59,971 ft. track; launches
Hol oman AFB, NM
projectiles at speeds of up to Mach
8
Air Force Research Laboratory
Mach 3-7
Wright-Patterson AFB, OH
(AFRL) Cel s 18, 22
AFRL Laser Hardened Materials
High-temperature materials testing
Wright-Patterson AFB, OH
Evaluation Laboratory (LHMEL)
AFRL Mach 6 High Reynolds
10-inch Mach 6
Wright-Patterson AFB, OH
Number (Re) Facility
Test Resource Management Center
Up to Mach 8; up to 4040 °F
Arnold AFB, TN
Hypersonic Aeropropulsion Clean
Air Test-bed Facility
Source: (U//FOUO) Paul F. Piscopo et al. Air Force AEDC Tunnel 9 was upgraded in 2019 to enable Mach 18
testing. See “Department of Defense Press Briefing on Hypersonics,” March 2, 2020, https://www.defense.gov/
Newsroom/Transcripts/Transcript/Article/2101062/department-of-defense-press-briefing-on-hypersonics/.

136 T he following information is derived from the 2014 report (U//FOUO) Paul F. Piscopo et al., (U) Study on the
Ability of the U.S. Test and Evaluation Infrastructure, and therefore, may not be current. Permission to use this material
has been granted by the Office of Science and T echnology Policy.
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Hypersonic Weapons: Background and Issues for Congress

Table A-2. DOD Open-Air Ranges
Range
Location
Ronald Reagan Bal istic Missile
Kwajalein Atol , Republic of the
Defense Test Site
Marshal Islands
Pacific Missile Range Facility (PMRF)
Kauai, HI
Western Range, 30th Space Wing
Vandenberg AFB, CA
Naval Air Warfare Center Weapons
Point Mugu and China Lake, CA
(NAWC) Division
White Sands Missile Range (WSMR)
New Mexico
Eastern Range, 45th Space Wing
Cape Canaveral Air Force
Station/Patrick AFB/Kennedy
Space Center, FL
NASA Wal ops Flight Facility
Wal ops Island, VA
Pacific Spaceport Complex (formerly
Kodiak Island, AK
Kodiak Launch Complex)
NAWC Weapons Division R-2508
Edwards AFB, CA
Complex
Utah Test and Training Range
Utah
Nevada Test and Training Range
Nevada
Source: (U//FOUO) Paul F. Piscopo et al.
Table A-3. DOD Mobile Assets
Asset
Navy Mobile Instrumentation
System
PMRF Mobile At-sea Sensor System
MDA Mobile Instrumentation
System Pacific Col ector
MDA Mobile Instrumentation
System Pacific Tracker
Kwajalein Mobile Range Safety
System 2
United States Navy Ship Lorenzen
missile range instrumentation ship
Sea-based X-band Radar
Aircraft Mobile Instrumentation
Systems
Transportable Range Augmentation
and Control System
Re-locatable MPS-36 Radar
Transportable Telemetry System
Source: (U//FOUO) Paul F. Piscopo et al.
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Table A-4. NASA Research-Related Facilities
Facility
Capability
Location
Ames Research Center (ARC) High-temperature
Mountain View, CA
Arc Jet Complex
materials testing
ARC Hypervelocity Free
Launches projectiles at
Mountain View, CA
Flight Facilities
speeds of up to Mach 23
Langley Research Center
31-inch Mach 10, 20-inch
Hampton, VA
(LaRC) Aerothermodynamics
Mach 6, and 15-inch Mach
Laboratory
6
LaRC 8-foot High
96-inch Mach 5 and Mach
Hampton, VA
Temperature Tunnel
6.5
LaRC Scramjet Test Complex
Up to Mach 8 and up to
Hampton, VA
4740 °F
LaRC HyPulse Facility
Currently inactive
Long Island, NY
Glenn Research Center
Mach 5, 6, and 7 and up to
Sandusky, OH
(GRC) Plumbrook Hypersonic
3830 °F
Tunnel Facility Arc Jet Facility
GRC Propulsion Systems
Mach 6
Cleveland, OH
Laboratory 4
GRC 1’ x 1’ Supersonic Wind
12-inch Mach 1.3-6 (10
Cleveland, OH
Tunnel
discrete airspeeds) and up
to 640 °F
Source: (U//FOUO) Paul F. Piscopo et al.
Table A-5. Department of Energy Research-Related Facilities
Facility
Capability
Location
Sandia National Laboratories Solar
High-temperature materials testing
Albuquerque, NM
Thermal Test Facility
and aerodynamic heating simulation
Sandia National Laboratories
18-inch Mach 5, 8, and 14
Albuquerque, NM
Hypersonic Wind Tunnel
Source: (U//FOUO) Paul F. Piscopo et al.
Table A-6. Industry/Academic Research-Related Facilities
Facility
Capability
Location
CUBRC Large Energy National
LENS 1: Mach 6-22
Buffalo, NY
Shock (LENS)-1/-II/-XX Tunnels
LENS II: Mach 2-12
LENS XX: Atmospheric reentry
simulation
Boeing Polysonic Wind Tunnel
48-inch up to Mach 5
St. Louis, MO
Lockheed Martin High Speed Wind
48-inch Mach .3-5
Dal as, TX
Tunnel
Boeing/Air Force Office of Scientific
9.5-inch Mach 6
West Lafayette, IN
Research (AFOSR) Quiet Tunnel at
Purdue University
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AFOSR-University of Notre Dame
24-inch Mach 6
Notre Dame, IN
Quiet Tunnel
Stratolaunch Carrier Aircraft
Reusable Mach 6 test bed
N/A
Sources: (U//FOUO) Paul F. Piscopo et al.; Oriana Pawlyk, “Air Force Expanding Hypersonic Technology
Testing”; University of Arizona, “Mach 5 Quiet Ludwieg Tube”; and Ashley Tressel, “Army to open hypersonic
testing facility.”
Notes: Hypersonic wind tunnels are under construction at the fol owing universities: Texas A&M University
(Mach 10 quiet tunnel expected to be complete in 2021), the University of Arizona (Mach 5 quiet tunnel
expected to be complete in 2021), Purdue University (Mach 8 quiet tunnel expected to be complete in 2022),
and the University of Notre Dame (Mach 10 quiet tunnel expected to be complete in 2023). Additional
universities, such as the University of Maryland, the California Institute of Technology, the Georgia Institute of
Technology, the Air Force Academy, the University of Tennessee Space Institute, and Virginia Polytechnic
Institute and State University, also maintain experimental hypersonic facilities or conduct hypersonic research.

Author Information

Kelley M. Sayler

Analyst in Advanced Technology and Global
Security

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Congressional Research Service
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