The United States secretary of defense (SecDef) is the head of the
United States Department of Defense, the
executive department
The Executive, also referred as the Executive branch or Executive power, is the term commonly used to describe that part of government which enforces the law, and has overall responsibility for the governance of a state.
In political systems ba ...
of the
U.S. Armed Forces
The United States Armed Forces are the military forces of the United States. The armed forces consists of six service branches: the Army, Marine Corps, Navy, Air Force, Space Force, and Coast Guard. The president of the United States is the ...
, and is a high ranking member of the
federal cabinet.
[ DoDD 5100.1: Enclosure 2: a] The secretary of defense's position of command and authority over the military is second only to that of the
president of the United States, who is the
commander-in-chief. This position corresponds to what is generally known as a
defense minister in many other countries. The secretary of defense is appointed by the president with the
advice and consent of the
Senate
A senate is a deliberative assembly, often the upper house or chamber of a bicameral legislature. The name comes from the ancient Roman Senate (Latin: ''Senatus''), so-called as an assembly of the senior (Latin: ''senex'' meaning "the el ...
, and is by custom a member of the Cabinet and by law a member of the
National Security Council
A national security council (NSC) is usually an executive branch governmental body responsible for coordinating policy on national security issues and advising chief executives on matters related to national security. An NSC is often headed by a na ...
.
The secretary of defense is a
statutory office, and the general provision in provides that "subject to the direction of the President", its occupant has "authority, direction, and control over the Department of Defense". The same statute further designates the secretary as "the principal assistant to the President in all matters relating to the Department of Defense". To ensure
civilian control of the military, no one may be appointed as the secretary of defense within seven years of serving as a
commissioned officer
An officer is a person who holds a position of authority as a member of an armed force or uniformed service.
Broadly speaking, "officer" means a commissioned officer, a non-commissioned officer, or a warrant officer. However, absent context ...
of a regular military component (i.e., non-
reserve) without a waiver from Congress.
Subject only to the orders of the president, the secretary of defense is in the
chain of command and exercises
command and control, for both operational and administrative purposes, over all service branches administered by the Department of Defensethe
Army,
Marine Corps,
Navy,
Air Force, and
Space Force
A space force is a military branch of a nation's armed forces that conducts military operations in outer space and space warfare. The world's first space force was the Russian Space Forces, established in 1992 as an independent military service. ...
as well as the
Coast Guard when its command and control is transferred to the Department of Defense.
[ Joint Publication 1: II-9, II-10 & II-11.] Only the secretary of defense (or the president or Congress) can authorize the transfer of operational control of forces between the three military departments (
Department of the Army
The United States Department of the Army (DA) is one of the three military departments within the Department of Defense of the U.S. The Department of the Army is the federal government agency within which the United States Army (U.S.) is org ...
,
the Navy, and
the Air Force) and the eleven
Unified Combatant Commands.
Because the secretary of defense is vested with legal powers that exceed those of any
commissioned officer
An officer is a person who holds a position of authority as a member of an armed force or uniformed service.
Broadly speaking, "officer" means a commissioned officer, a non-commissioned officer, or a warrant officer. However, absent context ...
, and is second only to the president in the military hierarchy, its incumbent has sometimes unofficially been referred to as "deputy
commander-in-chief".
[ Trask & Goldberg: pp.11 & 52][ Cohen: p.231.] The
chairman of the Joint Chiefs of Staff
The chairman of the Joint Chiefs of Staff (CJCS) is the presiding officer of the United States Joint Chiefs of Staff (JCS). The chairman is the highest-ranking and most senior military officer in the United States Armed Forces Chairman: app ...
is the principal military adviser to the secretary of defense and the president; while the chairman may assist the secretary and president in their command functions, the chairman is not in the chain of command.
The
secretary of state, the
secretary of the treasury, the secretary of defense, and the
attorney general
In most common law jurisdictions, the attorney general or attorney-general (sometimes abbreviated AG or Atty.-Gen) is the main legal advisor to the government. The plural is attorneys general.
In some jurisdictions, attorneys general also have exec ...
are generally regarded as the four most important (and are officially the four most senior and oldest) cabinet officials because of the size and importance of their respective departments.
The current secretary of defense is retired
general Lloyd Austin, who is the first African American to serve in the position.
History

An Army, Navy, and Marine Corps were established in 1775, in concurrence with the
American Revolution. The
War Department, headed by the
secretary of war, was created by
Act of Congress
An Act of Congress is a statute enacted by the United States Congress. Acts may apply only to individual entities (called Public and private bills, private laws), or to the general public (Public and private bills, public laws). For a Bill (law) ...
in 1789 and was responsible for both the Army and Navy until the founding of a separate
Department of the Navy Navy Department or Department of the Navy may refer to:
* United States Department of the Navy,
* Navy Department (Ministry of Defence), in the United Kingdom, 1964-1997
* Confederate States Department of the Navy, 1861-1865
* Department of the Na ...
in 1798.
Based on the experiences of
World War II, proposals were soon made on how to more effectively manage the large combined military establishment. The Army generally favored centralization while the Navy had institutional preferences for decentralization and the status quo. The resulting
National Security Act of 1947
The National Security Act of 1947 ( Pub.L.br>80-253 61 Stat.br>495 enacted July 26, 1947) was a law enacting major restructuring of the United States government's military and intelligence agencies following World War II. The majority of the pro ...
was largely a compromise between these divergent viewpoints. It renamed the
Department of War War Department may refer to:
* War Department (United Kingdom)
* United States Department of War (1789–1947)
See also
* War Office, a former department of the British Government
* Ministry of defence
* Ministry of War
* Ministry of Defence
* D ...
the
Department of the Army
The United States Department of the Army (DA) is one of the three military departments within the Department of Defense of the U.S. The Department of the Army is the federal government agency within which the United States Army (U.S.) is org ...
, and added both it and the
Department of the Navy Navy Department or Department of the Navy may refer to:
* United States Department of the Navy,
* Navy Department (Ministry of Defence), in the United Kingdom, 1964-1997
* Confederate States Department of the Navy, 1861-1865
* Department of the Na ...
to a newly established
National Military Establishment (NME). The Act also separated the
Army Air Forces
The United States Army Air Forces (USAAF or AAF) was the major land-based aerial warfare service component of the United States Army and ''de facto'' aerial warfare service branch of the United States during and immediately after World War II ...
from the Army to become its own branch of service, the
United States Air Force.
A new title was coined by the Act for the head of the NME: Secretary of Defense. At first, each of the service secretaries maintained cabinet status. The first secretary of defense,
James Forrestal, who in his previous capacity as the
secretary of the Navy had opposed the creation of the new position, found it difficult to exercise authority over the other branches with the limited powers his office had at the time. To address this and other problems, the National Security Act was amended in 1949 to further consolidate the national defense structure in order to reduce
interservice rivalry, directly subordinate the
secretaries of the Army, the Navy and the
Air Force to the secretary of defense in the chain of command, and rename the National Military Establishment as the Department of Defense, making it one
Executive Department
The Executive, also referred as the Executive branch or Executive power, is the term commonly used to describe that part of government which enforces the law, and has overall responsibility for the governance of a state.
In political systems ba ...
. The position of the
deputy secretary of defense, the number two position in the department, was also created at this time.
The general trend since 1949 has been to further centralize management in the Department of Defense, elevating the status and authorities of civilian
OSD OSD may refer to:
Science and medicine
* Ocean Science Discussions, the discussion and review section of the journal ''Ocean Science''
* Optimal shape design, a part of the field of optimal control theory
* Oral sedation dentistry, the oral admi ...
appointees and defense-wide organizations at the expense of the military departments and the services within them. The last major revision of the statutory framework concerning the position was done in the
Goldwater–Nichols Department of Defense Reorganization Act of 1986. In particular, it elevated the status of joint service for commissioned officers, making it in practice a requirement before appointments to general officer and flag officer grades could be made.
As the secretary of defense is a civilian position intended to be independent of the active-duty leadership, a secretary is required to have been retired from service for at least seven (originally ten) years unless a waiver is approved by Congress. Since the creation of the position in 1947, such a waiver has been approved only three times, for Army general
George Marshall in 1950, Marine Corps General
Jim Mattis in 2017, and retired Army general
Lloyd J. Austin III
Lloyd James Austin III (born August 8, 1953) is a retired United States Army four-star general who, since his appointment on January 22, 2021, has served as the 28th United States secretary of defense. He is the first African American to serv ...
in 2021.
Powers and functions

The secretary of defense, appointed by the
president with the advice and consent of the
Senate
A senate is a deliberative assembly, often the upper house or chamber of a bicameral legislature. The name comes from the ancient Roman Senate (Latin: ''Senatus''), so-called as an assembly of the senior (Latin: ''senex'' meaning "the el ...
, is by federal law () the head of the Department of Defense, "the principal assistant to the President in all matters relating to Department of Defense", and has "authority, direction and control over the Department of Defense". Because the
Constitution vests all military authority in
Congress and the president, the statutory authority of the secretary of defense is derived from their constitutional authorities. Since it is impractical for either Congress or the president to participate in every piece of Department of Defense affairs, the secretary of defense and the secretary's subordinate officials generally exercise military authority.
As the head of DoD, all officials, employees and service members are "under" the secretary of defense. Some of those high-ranking officials, civil and military (outside of OSD and the Joint Staff) are: the
secretary of the Army
The secretary of the Army (SA or SECARMY) is a senior civilian official within the United States Department of Defense, with statutory responsibility for all matters relating to the United States Army: manpower, personnel, reserve affairs, insta ...
,
secretary of the Navy, and
secretary of the Air Force,
Army chief of staff,
commandant of the Marine Corps
The commandant of the Marine Corps (CMC) is normally the highest-ranking officer in the United States Marine Corps and is a member of the Joint Chiefs of Staff. Joint Chiefs of Staff: composition; functions. The CMC reports directly to the secr ...
,
chief of naval operations
The chief of naval operations (CNO) is the professional head of the United States Navy. The position is a statutory office () held by an admiral who is a military adviser and deputy to the secretary of the Navy. In a separate capacity as a memb ...
,
Air Force chief of staff,
chief of space operations, and
chief of the National Guard Bureau and the combatant commanders of the
Combatant Commands. All these high-ranking positions, civil and military, require Senate confirmation.
The Department of Defense is composed of the
Office of the Secretary of Defense
The Office of the Secretary of Defense (OSD) is a headquarters-level staff of the United States Department of Defense. It is the principal civilian staff element of the U.S. Secretary of Defense, and it assists the Secretary in carrying out aut ...
(OSD), the
Joint Chiefs of Staff (JCS) and the
Joint Staff (JS),
Office of the Inspector General (DODIG), the
Combatant Commands
A unified combatant command (CCMD), also referred to as a combatant command, is a joint military command of the United States Department of Defense that is composed of units from two or more service branches of the United States Armed Forces, an ...
, the Military Departments (
Department of the Army
The United States Department of the Army (DA) is one of the three military departments within the Department of Defense of the U.S. The Department of the Army is the federal government agency within which the United States Army (U.S.) is org ...
(DA),
Department of the Navy Navy Department or Department of the Navy may refer to:
* United States Department of the Navy,
* Navy Department (Ministry of Defence), in the United Kingdom, 1964-1997
* Confederate States Department of the Navy, 1861-1865
* Department of the Na ...
(DON) &
Department of the Air Force (DAF)), the
Defense Agencies and DoD Field Activities, the
National Guard Bureau
The National Guard Bureau is the federal instrument responsible for the administration of the National Guard established by the United States Congress as a joint bureau of the Department of the Army and the Department of the Air Force. It was cre ...
(NGB), and such other offices, agencies, activities, organizations, and commands established or designated by law, or by the president or by the secretary of defense.
Department of Defense Directive 5100.01 describes the organizational relationships within the Department and is the foundational issuance for delineating the major functions of the Department. The latest version, signed by former secretary of defense
Robert Gates in December 2010, is the first major re-write since 1987.
[ Department of Defense Directive 5100.01 Functions of the Department of Defense and Its Major Components][ DoDD 5100.1: p.1.]
Office of the Secretary of Defense
The secretary's principally civilian staff element is called the
Office of the Secretary of Defense
The Office of the Secretary of Defense (OSD) is a headquarters-level staff of the United States Department of Defense. It is the principal civilian staff element of the U.S. Secretary of Defense, and it assists the Secretary in carrying out aut ...
(OSD) and is composed of the
deputy secretary of defense (DEPSECDEF) and five under secretaries of defense in the fields of
acquisition & sustainment,
research & engineering,
comptroller/chief financial officer,
intelligence,
personnel & readiness, and
policy; several
assistant secretaries of defense
Assistant Secretary of Defense is a title used for many high-level executive positions in the Office of the Secretary of Defense within the U.S. Department of Defense. The Assistant Secretary of Defense title is junior to Under Secretary of Defen ...
; other directors and the staffs under them.
The name of the principally military staff organization, organized under the chairman of the Joint Chiefs of Staff, is the
Joint Staff (JS).
Awards and decorations
The
Defense Distinguished Service Medal (DDSM), the
Defense Superior Service Medal
The Defense Superior Service Medal (DSSM) is a military decoration of the United States Department of Defense, which is presented to United States Armed Forces service members who perform superior meritorious service in a position of significant ...
(DSSM), the
Defense Meritorious Service Medal (DMSM), the
Joint Service Commendation Medal (JSCM) and the
Joint Service Achievement Medal
The Achievement Medal is a military decoration of the United States Armed Forces. The Achievement Medal was first proposed as a means to recognize outstanding achievement or meritorious service of military personnel who were not eligible to rece ...
(JSAM) are awarded, to military personnel for service in joint duty assignments, in the name of the secretary of defense. In addition, there is the
Joint Meritorious Unit Award (JMUA), which is the only ribbon (as in non-medal) and unit award issued to joint DoD activities, also issued in the name of the secretary of defense.
The DDSM is analogous to the distinguished services medals issued by the military departments (i.e.
Army Distinguished Service Medal
The Distinguished Service Medal (DSM) is a military decoration of the United States Army that is presented to soldiers who have distinguished themselves by exceptionally meritorious service to the government in a duty of great responsibility. Th ...
,
Navy Distinguished Service Medal
The Navy Distinguished Service Medal is a military decoration of the United States Navy and United States Marine Corps which was first created in 1919 and is presented to sailors and Marines to recognize distinguished and exceptionally meritoriou ...
&
Air Force Distinguished Service Medal), the DSSM corresponds to the
Legion of Merit
The Legion of Merit (LOM) is a military award of the United States Armed Forces that is given for exceptionally meritorious conduct in the performance of outstanding services and achievements. The decoration is issued to members of the eight ...
, the DMSM to the
Meritorious Service Medal, the JSCM to the service commendation medals, and the JSAM to the achievement medals issued by the services. While the approval authority for DSSM, DMSM, JSCM, JSAM and JMUA is delegated to inferior DoD officials: the DDSM can be awarded only by the secretary of defense.
Recommendations for the
Medal of Honor (MOH), formally endorsed in writing by the secretary of the military department concerned and the
chairman of the Joint Chiefs of Staff
The chairman of the Joint Chiefs of Staff (CJCS) is the presiding officer of the United States Joint Chiefs of Staff (JCS). The chairman is the highest-ranking and most senior military officer in the United States Armed Forces Chairman: app ...
, are processed through the
under secretary of defense for personnel and readiness, and such recommendations be must approved by the secretary of defense before it can be handed over to the president, who is the final approval authority for the MOH, although it is awarded in the name of
Congress.
The secretary of defense, with the concurrence of the
secretary of state, is the approval authority for the acceptance and wear of
NATO medals issued by the
secretary general of NATO and offered to the
U.S. permanent representative to NATO in recognition of U.S. servicemembers who meet the eligibility criteria specified by NATO.
[ DoDM 1348.33, Vol 3: p.39 (Enclosure 3)]
Congressional committees
As the head of the department, the secretary of defense is the chief witness for the congressional committees with oversight responsibilities over the Department of Defense. The most important committees, with respect to the entire department, are the two authorizing committees, the
Senate Armed Services Committee (SASC) and the
House Armed Services Committee (HASC), and the two appropriations committees, the
Senate Appropriations Committee and the
House Appropriations Committee.
For the DoD intelligence programs the
Senate Select Committee on Intelligence and the
House Permanent Select Committee on Intelligence have the principal oversight role.
National Security Council
The secretary of defense is a statutory member of the
National Security Council
A national security council (NSC) is usually an executive branch governmental body responsible for coordinating policy on national security issues and advising chief executives on matters related to national security. An NSC is often headed by a na ...
. As one of the principals, the secretary along with the
vice president, secretary of state and the
assistant to the president for national security affairs
The Assistant to the President for National Security Affairs (APNSA), commonly referred to as the National Security Advisor (NSA),The National Security Advisor and Staff: p. 1. is a senior aide in the Executive Office of the President, based at t ...
participates in biweekly Principals Committee (PC) meetings, preparing and coordinating issues before they are brought before full NSC sessions chaired by the president.
Role in the military justice system
The secretary is one of only five or six civiliansthe others being the president, the three "service secretaries" (the
secretary of the Army
The secretary of the Army (SA or SECARMY) is a senior civilian official within the United States Department of Defense, with statutory responsibility for all matters relating to the United States Army: manpower, personnel, reserve affairs, insta ...
,
secretary of the Navy, and
secretary of the Air Force), and the
secretary of homeland security (when the
United States Coast Guard is under the
United States Department of Homeland Security and has not been transferred to the
Department of the Navy Navy Department or Department of the Navy may refer to:
* United States Department of the Navy,
* Navy Department (Ministry of Defence), in the United Kingdom, 1964-1997
* Confederate States Department of the Navy, 1861-1865
* Department of the Na ...
under the Department of Defense)authorized to act as
convening authority
The term convening authority is used in United States military law to refer to an individual with certain legal powers granted under either the Uniform Code of Military Justice (i.e. the regular military justice system) or the Military Commissions ...
in the
military justice system for
General Courts-Martial (: article 22,
UCMJ
The Uniform Code of Military Justice (UCMJ, 10 U.S.C. §§ 801–946 is the foundation of military law in the United States. It was established by the United States Congress in accordance with the authority given by the United States Constitution ...
), Special Courts-Martial (: article 23, UCMJ), and Summary Courts-Martial (: article 24 UCMJ).
Salary
Secretary of Defense is a
Level I position in the Executive Schedule,
thus earning a salary of
US$
The United States dollar (symbol: $; code: USD; also abbreviated US$ or U.S. Dollar, to distinguish it from other dollar-denominated currencies; referred to as the dollar, U.S. dollar, American dollar, or colloquially buck) is the official ...
221,400, as of January 2021.
List of secretaries of defense
The longest-serving secretary of defense is
Robert McNamara, who served for a total of 7years, 39 days. Combining his two non-sequential services as the secretary of defense, the second-longest serving is
Donald Rumsfeld
Donald Henry Rumsfeld (July 9, 1932 – June 29, 2021) was an American politician, government official and businessman who served as Secretary of Defense from 1975 to 1977 under president Gerald Ford, and again from 2001 to 2006 under Presi ...
, who served just ten days fewer than McNamara. The second-longest unbroken tenure was Caspar Weinberger's, at 6years, 306 days.
The shortest-serving secretary of defense is
Elliot Richardson, who served 114 days and then was appointed
U.S. attorney general
The United States attorney general (AG) is the head of the United States Department of Justice, and is the chief law enforcement officer of the federal government of the United States. The attorney general serves as the principal advisor to the p ...
amid the
resignations
Resignation is the formal act of leaving or quitting one's office or position. A resignation can occur when a person holding a position gained by election or appointment steps down, but leaving a position upon the expiration of a term, or choos ...
of the
Watergate Scandal. (This is not counting
deputy secretaries of defense William P. Clements
William Perry Clements Jr. (April 13, 1917 – May 29, 2011) was an American businessman and Republican Party (United States), Republican Party politician who served two non-consecutive terms as the governor of Texas between 1979 and 19 ...
and
William Howard Taft IV
William Howard Taft IV (born September 13, 1945) is an attorney who has served in the United States government under several Republican administrations. He is the son of William Howard Taft III and the great-grandson of President William Howard T ...
, who each served a few weeks as temporary/acting secretary of defense).
For precursors to this position prior to the establishment of the Department of Defense, see the lists of
secretaries of the Navy and
secretaries of war prior to 1947.
; Parties
; Status
Succession
Presidential succession
The secretary of defense is sixth in the
presidential line of succession, following the
secretary of the treasury and preceding the
attorney general
In most common law jurisdictions, the attorney general or attorney-general (sometimes abbreviated AG or Atty.-Gen) is the main legal advisor to the government. The plural is attorneys general.
In some jurisdictions, attorneys general also have exec ...
.
Secretary succession
On December 10, 2020, President Donald Trump modified the order of succession for the office of Secretary of Defense in Executive Order 13963. The order of succession is:
See also
References
Citations
General sources
Federal law
*
Title 10 of the United States Code
*
Title 50 of the United States Code
Directives, regulations and manuals
*
*
*
*
*
*
Further reading
*
*
*
*
*
* Mahan, Erin R., and Jeffrey A. Larsen, eds. (2012)
"Evolution of the Secretary of Defense in the Era of Massive Retaliation: Charles Wilson, Neil McElroy, and Thomas Gates, 1953–1961" Cold War Foreign Policy Series: Special Study3 (September 2012), vii–41.
*
*
Primary historical sources
*
*
Online sources
*
External links
*
, -
{{DEFAULTSORT:United States Secretary Of Defense
1947 establishments in the United States
Defense, Secretary of
Defense
Defense or defence may refer to:
Tactical, martial, and political acts or groups
* Defense (military), forces primarily intended for warfare
* Civil defense, the organizing of civilians to deal with emergencies or enemy attacks
* Defense industr ...
Defence ministers