The secretary of defense (SecDef) is the leader and
chief executive officer of the
United States Department of Defense, the
executive department of the
U.S. Armed Forces.
[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, and is by custom a member of the
Cabinet and by law a member of the
National Security Council.
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 of a regular military component (i.e., non-
reserve).
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 Forceas 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 Navy, and
the Air Force) and the ten
Unified Combatant Commands.
Because the secretary of defense is vested with legal powers that exceed those of any
commissioned officer, 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 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 the treasury, the
secretary of state, the
attorney general, and the secretary of defense are generally regarded as the four most important 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 in 1789 and was responsible for both the Army and Navy until the founding of a separate
Department of the Navy 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 was largely a compromise between these divergent viewpoints. It renamed the
Department of War the
Department of the Army, and added both it and the
Department of the Navy to a newly established
National Military Establishment (NME). The Act also separated the
Army Air Forces 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 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 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 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 cilivian position intended to 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 in 2021.
Powers and functions

The secretary of defense, appointed by the
president with the advice and consent of the
Senate, 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,
secretary of the Navy, and
secretary of the Air Force,
Army chief of staff,
commandant of the Marine Corps,
chief of naval operations,
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 (OSD), the
Joint Chiefs of Staff (JCS) and the
Joint Staff (JS),
Office of the Inspector General (DODIG), the
Combatant Commands, the Military Departments (
Department of the Army (DA),
Department of the Navy (DON) &
Department of the Air Force (DAF)), the
Defense Agencies and DoD Field Activities, the
National Guard Bureau (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 (OSD) and is composed of the
deputy secretary of defense (DEPSECDEF) and five under secretaries of defense in the fields of
acquisition, technology & logistics,
comptroller/chief financial officer,
intelligence,
personnel & readiness, and
policy; several
assistant secretaries of defense; 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 (DSSM), the
Defense Meritorious Service Medal (DMSM), the
Joint Service Commendation Medal (JSCM) and the
Joint Service Achievement Medal (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,
Navy Distinguished Service Medal &
Air Force Distinguished Service Medal), the DSSM corresponds to the
Legion of Merit, 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, 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. 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 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,
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 under the Department of Defense)authorized to act as
convening authority in the
military justice system for
General Courts-Martial (: article 22,
UCMJ), 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$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, 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 amid the
resignations of the
Watergate Scandal. (This is not counting
deputy secretaries of defense William P. Clements and
William Howard Taft IV, who each served a few weeks as temporary/acting secretary of defense).
; 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.
Secretary succession
On December 10, 2020, President Donald Trump modified the order of succession for the office of Secretary of Defense in an Executive Order (unnumbered as of December 15, 2020). The order of succession is:
See also
References
Citations
General sources
Federal law
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Title 10 of the United States Code
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Title 50 of the United States Code
Directives, regulations and manuals
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Further reading
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* 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.
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Primary historical sources
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Online sources
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External links
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