Securing America’s Borders:
The Role of the Military
R. Chuck Mason
Legislative Attorney
June 16, 2010
Congressional Research Service
7-5700
www.crs.gov
R41286
CRS Report for Congress
P
repared for Members and Committees of Congress
Securing America’s Borders: The Role of the Military
Summary
The Secretary of the Department of Homeland Security (DHS) is charged with preventing the
entry of terrorists, securing the borders, and carrying out immigration enforcement functions.
U.S. Customs and Border Protection (CBP), a component of DHS, has primary responsibility for
securing the borders of the United States, preventing terrorists and their weapons from entering
the United States, and enforcing hundreds of U.S. trade and immigration laws. Within CBP, the
U.S. Border Patrol’s mission is to detect and prevent the illegal entry of aliens across the nearly
7,000 miles of Mexican and Canadian international borders and 2,000 miles of coastal borders
surrounding Florida and Puerto Rico.
Although the military does not have primary responsibility to secure the borders, the Armed
Forces generally provide support to law enforcement and immigration authorities along the
southern border. Reported escalations in criminal activity and illegal immigration, however, have
prompted some lawmakers to reevaluate the extent and type of military support that occurs in the
border region. On May 25, 2010, President Obama announced that up to 1,200 National Guard
troops would be sent to the border to support the Border Patrol. Addressing domestic laws and
activities with the military, however, might run afoul of the Posse Comitatus Act (PCA), which
prohibits use of the Armed Forces to perform the tasks of civilian law enforcement unless
explicitly authorized. There are alternative legal authorities for deploying the National Guard, and
the precise scope of permitted activities and funds may vary with the authority exercised.
In the 111th Congress, various types of legislation have been introduced, including S. 3332 and
H.R. 4321, which, if enacted, would authorize the utilization of National Guard troops along the
southern border. Additionally, H.Con.Res. 273 expresses the sense of Congress that the escalating
violence along the southern border is a national threat and that National Guard troops should be
deployed to the border.
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Securing America’s Borders: The Role of the Military
Contents
Background ................................................................................................................................ 1
Military Assistance...................................................................................................................... 2
Restrictions ........................................................................................................................... 3
Authorizations ...................................................................................................................... 3
The National Guard..................................................................................................................... 5
State Drug Plan ..................................................................................................................... 6
Other Duty............................................................................................................................ 6
Homeland Defense Activity .................................................................................................. 6
Legislation in the 111th Congress ................................................................................................. 7
Contacts
Author Contact Information ........................................................................................................ 7
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Securing America’s Borders: The Role of the Military
Background
The Secretary of the Department of Homeland Security (DHS) is charged with preventing the
entry of terrorists, securing the borders, and carrying out immigration enforcement functions.
U.S. Customs and Border Protection (CBP), a component of DHS, has primary responsibility for
securing the borders of the United States, preventing terrorists and their weapons from entering
the United States, and enforcing hundreds of U.S. trade and immigration laws. Within CBP, the
U.S. Border Patrol’s mission is to detect and prevent the illegal entry of aliens across the nearly
7,000 miles of Mexican and Canadian international borders and 2,000 miles of coastal borders
surrounding Florida and Puerto Rico.1
The Department of Defense’s (DOD’s) role in the execution of this responsibility is to provide
support to DHS and other federal, state, and local (and in some cases foreign) law enforcement
agencies, when requested. Since the 1980s, DOD, including the National Guard, as authorized by
Congress, has conducted a wide variety of counterdrug support missions along the borders of the
United States. Although DOD does not have the “assigned responsibility to stop terrorists from
coming across our borders,”2 its support role in counterdrug and counterterrorism efforts appears
to have increased the department’s profile in border security.
In 2006, in response to requests for support enforcing federal immigration laws from the
governors of Arizona, California, New Mexico, and Texas, President George W. Bush announced
the deployment of up to 6,000 National Guard troops along the southern border to support the
Border Patrol.3 During 2006–2008, more than 30,000 individuals participated in the mission
“Operation Jump Start.”4 The troops provided engineering, aviation, and entry identification
teams, as well as technical, logistical, and administrative support.5 The Guard units, serving
pursuant to Title 32 of the U.S. Code (see later discussion), remained under the control of the
respective governors, but were fully funded by the federal government and were not involved in
direct law-enforcement activities.6 Throughout Operation Jump Start, the federal government
continued to recruit and train thousands of additional Border Patrol agents, thereby reducing the
number of National Guard troops required to support the southern border.7 Operation Jump Start
officially concluded on July 15, 2008.8
Illegal drug activities and crime continue. After the murder of Arizona rancher Robert Krentz on
March 27, 2010, the day after the Border Patrol seized 290 pounds of marijuana near his ranch,9
1 For a discussion on the history and role of the U.S. Border Patrol, see CRS Report RL32562, Border Security: The
Role of the U.S. Border Patrol, by Chad C. Haddal.
2 Department of Defense, Strategy for Homeland Defense and Civil Support, at 5 (June 2005), available at
http://www.defense.gov/news/Jun2005/d20050630homeland.pdf.
3 Michael D. Doubler, Operation Jump Start: The National Guard on the Southwest Border, 2006-2008, available at
http://www.ng.mil/features/jumpstart/pdf/NGB_JumpStart.pdf.
4 Id. at Foreword by Lieutenant General H. Steven Blum, Chief, National Guard Bureau.
5 Id.
6 Operation Jump Start: The National Guard on the Southwest Border, 2006-2008, at 19.
7 National Guard Bureau After Action Report, Operation Jump Start: Operational Lessons Learned, NGB J7 Joint
Doctrine, Training and Force Development, Joint Lessons Learned Branch, March 11, 2009, at 4.
8 Id.
9 Christian Anderson, “Guard Responds to Border Violence,” GX Magazine, April 8, 2010, available at
http://nationalguard.com/news/2010/apr/09/guard-responds-to-border-violence.
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there have been calls for increased security along the border.10 The governors and adjutants
general of Arizona, California, New Mexico, and Texas requested that the Obama Administration
create a new federal border mission along the lines of Operation Jump Start from 2006.11
Following the murder of Krentz, Governor Bill Richardson of New Mexico ordered the National
Guard to patrol the border in order to ensure the safety of New Mexico citizens.12 And while
Governor Jan Brewer of Arizona has requested federal troops to protect the border, she has not
invoked her authority, as Governor Richardson did, citing Arizona’s troubled finances as
prohibiting such an act.13 Additionally, Members of Congress have called for the deployment of
National Guard troops along the southern border to “combat illegal immigration, drug and alien
smuggling, and violent activity.”14
On May 25, 2010, President Obama announced that up to 1,200 National Guard troops would be
sent to the southern border to support the Border Patrol. According to John Brennan and General
James Jones, the Assistant to the President for Homeland Security and the National Security
Advisor, respectively, the National Guard troops will be utilized as a “bridge to longer-term
enhancements in border protection and law enforcement personnel from the Departments of
Homeland Security and Justice to target illicit networks’ trafficking in people, drugs, illegal
weapons, money, and the violence associated with these illegal activities.”15 The President “called
immigration ‘inherently the job of the federal government,’ and said sending Guard members
would be a basic step in securing the border before other reforms are implemented through
legislation.”16 Further, President Obama stated that the National Guard troops would help with
intelligence work, drug and human trafficking interdiction, and relieving border guards on
security tasks so they can do more law enforcement.17
Military Assistance
The military does not appear to have a direct legislative mandate to protect or patrol the border or
to engage in immigration enforcement. Indeed, direct military involvement in law enforcement
activities without proper statutory authorization might run afoul of the Posse Comitatus Act.18
10 Id.
11 Id.
12 State of New Mexico, “Governor Bill Richardson Orders National Guard to Patrol the Mexican Border,” press
release, March 31, 2010, available at http://www.governor.state.nm.us/press/2010/march/033110_01.pdf.
13 Randol C. Archibold, “Obama to Send Up to 1,200 Troops to Border ,” The New York Times, May 25, 2010,
available at http://www.nytimes.com/2010/05/26/us/26border.html.
14 United States Senators McCain and Kyl, “McCain, Kyl Announce Border Security Plan, 10-Point Plan To Better
Secure The U.S.-Mexico Border in Arizona,” press release, April 19, 2010, available at http://mccain.senate.gov/
public/index.cfm?FuseAction=PressOffice.PressReleases&ContentRecord_id=18459278-ac95-e53d-0c3a-
427b2010565f&Region_id=&Issue_id=.
15 Letter from Assistant to the President for Homeland Security and Counterterrorism and National Security Advisor on
Southwest Border Security to Senator Levin, Chairman of Senate Armed Services Committee, available at
http://www.whitehouse.gov/sites/default/files/Letter_to_Chairman_Levin.pdf.
16 Lisa Daniel, “Obama: National Guard Can Aid Intelligence, Interdiction at Border,” GX News, May 27, 2010,
available at http://www.nationalguard.com/news/2010/may/27/obama-national-guard-can-aid-intelligence-interdiction-
at-border.
17 Id.
18 For a comprehensive discussion of the Posse Comitatus Act, see CRS Report 95-964, The Posse Comitatus Act and
Related Matters: The Use of the Military to Execute Civilian Law, by Charles Doyle.
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The military does have, however, general legislative authority that allows it to provide support to
federal, state, and local law enforcement agencies (LEAs) in counterdrug and counterterrorism
efforts, and in combating certain border-related immigration and smuggling crimes.19 Military
personnel for these operations are drawn from the active and reserve forces of the military and
from the National Guard.
Restrictions
The primary restriction on military participation in civilian law enforcement activities is the Posse
Comitatus Act (PCA).20 The PCA prohibits the use of the Army and Air Force to execute the
domestic laws of the United States except where expressly authorized by the Constitution or
Congress. The PCA has been further applied to the Navy and Marine Corps by legislative and
administrative supplements. For example, 10 U.S.C. § 375 directs the Secretary of Defense to
promulgate regulations forbidding the direct participation “by a member of the Army, Navy, Air
Force, or Marines in a search, seizure, arrest, or other similar activity” during support activities to
civilian law enforcement agencies. DOD issued Directive 5525.5, which outlines its policies and
procedures for supporting federal, state, and local LEAs. DOD Directive 5525.5 prohibits the
following forms of direct assistance: (1) interdiction of a vehicle, vessel, aircraft, or other similar
activity; (2) a search or seizure; (3) an arrest, apprehension, stop and frisk, or similar activity; and
(4) use of military personnel in the pursuit of individuals, or as undercover agents, informants,
investigators, or interrogators. It is generally accepted that the PCA does not apply to the actions
of the National Guard when not in federal service.21 As a matter of policy, however, National
Guard regulations stipulate that its personnel are not, except for exigent circumstances or as
otherwise authorized, to directly participate in the arrest or search of suspects or the general
public.22
Authorizations
The PCA does not apply “in cases and under circumstances expressly authorized by the
Constitution.” Congress is empowered, under the Constitution, to call forth the militia to execute
the laws of the Union.23 The Constitution, however, contains no provision expressly authorizing
the President to use the military to execute the law. The question of whether the constitutional
exception includes instances where the President is acting under implied or inherent constitutional
powers is one the courts have yet to answer. DOD regulations, nonetheless, do assert two
constitutionally based exceptions—sudden emergencies and protection of federal property.24 The
PCA also does not apply where Congress has expressly authorized use of the military to execute
domestic law. Congress has done so in three ways: by giving a branch of the Armed Forces
19 10 U.S.C. § 374(b).
20 18 U.S.C. § 1385.
21 See Gilbert v. United States, 165 F.3d 470, 473 (6th Cir. 1999); United States v. Hutchings, 127 F.3d 1255, 1258 (10th
Cir. 1997); United States v. Benish, 5 F.3d 20, 25-6 (3d Cir. 1993); United States v. Kyllo, 809 F. Supp 787, 792-93
(D.Ore. 1992); Wallace v. State, 933 P.2d 1157, 1160 (Alaska App. 1997); see also DOD Directive 5525.5.
22 National Guard Regulation 500-2/Air National Guard Instruction 10-801, National Guard Counterdrug Support,
August 29, 2008, available at http://www.ngbpdc.ngb.army.mil/pubs/10/500_2_10-801.pdf.
23 U.S. Const. Art. I, § 8, cl. 15.
24 32 C.F.R. § 215.4.
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civilian law enforcement authority (e.g., the Coast Guard25), by addressing certain circumstances
with more narrowly crafted legislation,26 and by establishing general rules for certain types of
assistance.
The military indirectly supports border security and immigration control efforts under general
legislation that authorizes the Armed Forces to support federal, state, and local LEAs. Since the
early 1980s, Congress has periodically authorized an expanded role for the military in providing
support to LEAs. Basic authority for most DOD assistance was originally passed in 1981 and is
contained in Chapter 18 of Title 10 of the U.S. Code—Military Support for Civilian Law
Enforcement Agencies. Under Chapter 18 of Title 10, Congress authorizes DOD to share
information (§ 371); loan equipment and facilities (§ 372); provide expert advice and training
(§ 373); and maintain and operate equipment (§ 374). For federal LEAs, DOD personnel may be
made available, under § 374, to maintain and operate equipment in conjunction with
counterterrorism operations (including the rendition of a suspected terrorist from a foreign
country) or the enforcement of counterdrug laws, immigration laws, and customs requirements.
For any civilian LEA, § 374 allows DOD personnel to maintain and operate equipment for a
variety of purposes, including aerial reconnaissance and the detection, monitoring, and
communication of air and sea traffic, and of surface traffic outside the United States or within 25
miles of U.S. borders, if first detected outside the border. Congress placed several stipulations on
Chapter 18 assistance (e.g., LEAs must reimburse DOD for the support it provides unless the
support “is provided in the normal course of military training or operations” or if it “results in a
benefit ... substantially equivalent to that which would otherwise be obtained from military
operations or training.”)27 Pursuant to § 376, DOD can only provide such assistance if it does not
adversely affect “the military preparedness of the United States.” Congress incorporated posse
comitatus restrictions into Chapter 18 activities in § 375.
In 1989, Congress began to expand the military’s support role. For example, Congress directed
DOD, to the maximum extent practicable, to conduct military training exercises in drug-
interdiction areas, and made DOD the lead federal agency for the detection and monitoring of
aerial and maritime transit of illegal drugs into the United States.28 Congress later provided
additional authorities for military support to LEAs specifically for counterdrug purposes in the
National Defense Authorization Act for FY1991.29 Section 1004 authorized DOD to extend
support in several areas to any federal, state, and local (and sometimes foreign) LEA requesting
counterdrug assistance. This section has been extended regularly and is now in force through the
end of FY2011.30
25 The legal basis for the Coast Guard is Title 14 of the United States Code, which states: “The Coast Guard as
established January 28, 1915, shall be a military service and a branch of the armed forces of the United States at all
times.” Upon the declaration of war or when the President directs, the Coast Guard operates under the authority of the
Department of the Navy. When not under the authority of the Department of the Navy, the United States Coast Guard is
under the authority of the Department of Homeland Security.
26 See, e.g., 10 U.S.C. §§ 331-333 (to suppress insurrections).
27 10 U.S.C. § 377.
28 National Defense Authorization Act for FY1990 and 1991, P.L. 101-189, Div. A, Tit. XII, § 1202(a)(1), codified at
10 U.S.C. § 124. A similar provision was first passed as part of the National Defense Authorization for FY1989 (P.L.
100-456), but was repealed by P.L. 101-189.
29 P.L. 101-510, Div. A, Tit. X, § 1004, codified at 10 U.S.C. § 374 note.
30 P.L. 109-364, Div. A, Tit. X, § 1021 (extending § 1004 through FY2011).
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As amended, § 1004 authorizes the military to maintain, upgrade, and repair military equipment;
transport federal, state, local, and foreign law enforcement personnel and equipment within or
outside the United States; establish bases for operations or training; train law enforcement
personnel in counterdrug activities; detect, monitor, and communicate movements of air, sea, and
surface traffic outside the United States, and within 25 miles of the border if the detection
occurred outside the United States; construct roads, fences, and lighting along the U.S. border;
provide linguists and intelligence analysis services; conduct aerial and ground reconnaissance;
and establish command, control, communication, and computer networks for improved
integration of law enforcement, active military, and National Guard activities. Section 1004
incorporates the posse comitatus restrictions of Chapter 18.31 Unlike Chapter 18, however, this
law does allow support which could affect military readiness in the short term, provided the
Secretary of Defense believes the support outweighs such short-term adverse effect.
The National Guard
The National Guard is a military force that is shared by the states and the federal government and
often assists in counterdrug and counterterrorism efforts. The term “National Guard” generally
refers to the Army National Guard and the Air National Guard.32 As such, they are the “organized
militia” of the states, Puerto Rico, Guam, the U.S. Virgin Islands, and the District of Columbia,
which are organized, armed, and equipped wholly or partly at federal expense, and are federally
recognized.33 However, when in a federal status, the organizations are referred to as the Army
National Guard of the United States and the Air National Guard of the United States and are the
reserve components of the Army and Air Force.34 While the District of Columbia National Guard
is an exclusively federal organization and operates under federal control at all times, the other 53
National Guards operate as state or territorial organizations most of the time. Members of the
National Guard may be called to active duty in an exclusively federal status (Title 10), in an
exclusively state status, or under state control with federal pay and benefits (Title 32).
Under “Title 10 duty status,” National Guard personnel operate under the control of the President,
receive federal pay and benefits, and are subject to the PCA.35 Typically, however, the National
Guard operates under the control of state and territorial governors. In “state active duty,” National
Guard personnel operate under the control of their governor, are paid according to state law, can
perform activities authorized by state law, and are not subject to the restrictions of the PCA.
Because border security is primarily a federal concern, some states have looked to the federal
government for funding to support some of their National Guard activities. Under Title 32 of the
U.S. Code, National Guard personnel generally serve a federal purpose and receive federal pay
and benefits, but command and control remain with the governor. This type of service is
commonly referred to as “Title 32 duty status,” and examples are discussed below. The 6,000
National Guard troops deployed in support of Operation Jump Start were under the authority of
31 Id. at § 1021(g).
32 32 U.S.C. § 101(3).
33 Id. at § 101(4) and (6).
34 Id. at § 101(5) and (7).
35 10 U.S.C. §§ 12301-12304. However, it appears that the National Guard could be deployed by the President under 10
U.S.C. §§ 331-333 and § 12406 to “execute the laws of the United States.”
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32 U.S.C. § 502(a), which allows the Secretary of the Army and Air Force to prescribe
regulations for National Guard drill and training and § 502(f), described below.36
State Drug Plan
Federal funding may be provided to a state for the implementation of a drug interdiction program
in accordance with 32 U.S.C. § 112. Under this section, the Secretary of Defense may grant
funding to the governor of a state who submits a “drug interdiction and counterdrug activities
plan” that satisfies certain statutory requirements. The Secretary of Defense is charged with
examining the sufficiency of the drug interdiction plan and determining whether the distribution
of funds would be proper. While the emphasis is certainly on counterdrug efforts, a state plan
might include some related border security and immigration-related functions that overlap with
drug interdiction activities. By approving the state of Arizona’s drug interdiction plan, the
Secretary of Defense has enabled the Arizona National Guard to engage in some border security
measures. For example, as part of its continuing requests for additional National Guard troops
under the Joint Counter Narco-Terrorism Task Force (JCNTF), Arizona cites the negative impacts
of illegal drug trade and illegal immigration on the southwestern border states as support for its
request.37
Other Duty
Section 502(f) of Title 32 has been used to expand the operational scope of the National Guard
beyond its specified duties. This provision provides that “a member of the National Guard may ...
without his consent, but with the pay and allowances provided by law ... be ordered to perform
training or other duty” in addition to those he or she is already prescribed to perform (emphasis
added). This is the provision of law that was used to provide federal pay and benefits to the
National Guard personnel who provided security at many of the nation’s airports after September
11 and who participated in Hurricanes Katrina and Rita-related disaster relief operations.
Homeland Defense Activity
In 2004, Congress passed another law that could arguably provide federal funding for National
Guard personnel conducting border security operations under Title 32.38 In the event of a
“homeland defense activity,” Chapter 9 of Title 32 of the U.S. Code authorizes the Secretary of
Defense to provide federal funding at his discretion to a state, under the authority of the governor
of that state, for the use of its National Guard forces if their participation is “necessary and
appropriate.”39 A “homeland defense activity” is statutorily defined as “an activity undertaken for
the military protection of the territory or domestic population of the United States ... from a threat
36 Operation Jump Start: The National Guard on the Southwest Border, 2006-2008 at 19.
37 Letter from Arizona Governor Jan Brewer to President Barack Obama regarding continued and additional National
Guard programs, May 20, 2010 (supporting documentation attached to letter includes previous 2009 letter from
Governor Brewer to Secretary of Defense Gates regarding additional troops for the CJNTF), available at
http://azgovernor.gov/dms/upload/PR_052110_BorderAircraftProposalLtrtoPresObama.pdf.
38 Defense Authorization Act for Fiscal Year 2005, P.L. 108-375, Div. A, Tit. V, Subtitle B, §§ 901-908.
39 32 U.S.C. § 905.
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or aggression against the United States.”40 Although a deployment of National Guard troops for
border security purposes could arguably be an activity “undertaken for the military protection” of
a “domestic population,” it is unclear whether the porous nature of the border or illegal entry of
aliens is the type of “threat” or “aggression” that would be “necessary and appropriate” for
National Guard troops.
Legislation in the 111th Congress
In the 111th Congress, various legislation has been introduced, including S. 3332 and H.R. 4321,
which, if enacted, would authorize the utilization of National Guard troops along the southern
border. S. 3332, entitled the Border Security Enforcement Act and introduced by Senators
McCain and Kyl, would implement their “10-Point Plan To Better Secure The U.S.-Mexico
Border In Arizona,” including the deployment of 3,000 National Guard troops along the
Arizona/Mexico border, as well as permanently add 3,000 Border Patrol agents to the border.41
H.R. 4321, entitled the Comprehensive Immigration Reform for America’s Security and
Prosperity Act of 2009, would prohibit the utilization of military forces, including the National
Guard, from assisting in the enforcement of immigration laws.42 However, an exception exists
allowing the President, during a national emergency or for specific counterterrorism duties, to
utilize the military forces, including the National Guard, to enforce immigration laws with
various restrictions on allowed activities. Additionally, H.Con.Res. 273 expresses the sense of
Congress that the escalating violence along the southern border is a national threat and that
National Guard troops should be deployed, as has been requested by numerous governors and
Members of Congress, to the southern border with clear rules of engagement and the right to
defend themselves if attacked.43
Author Contact Information
R. Chuck Mason
Legislative Attorney
rcmason@crs.loc.gov, 7-9294
40 DOD Directive 3160.01, Homeland Defense Activities Conducted by the National Guard (August 25, 2008),
implementing Sections 901-908 of Title 32, does not provide additional guidance as to the question of whether border
security operations could be considered homeland defense activities and thus eligible for DOD funding to the States.
41 S. 3332, 111th Cong., 2nd Sess. (2010). See also United States Senators McCain and Kyl, “McCain, Kyl Announce
Border Security Plan, 10-Point Plan To Better Secure The U.S.-Mexico Border in Arizona,” press release, April 19,
2010, available at http://mccain.senate.gov/public/index.cfm?FuseAction=PressOffice.PressReleases&
ContentRecord_id=18459278-ac95-e53d-0c3a-427b2010565f&Region_id=&Issue_id=.
42 H.R. 4321, 111th Cong., 1st Sess., § 131 (2009).
43 H.Con.Res. 273, 111th Cong., 2nd Sess., (2010).
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