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The United States secretary of defense (SecDef) is the head of the
United States Department of Defense The United States Department of Defense (DoD, USDOD or DOD) is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government directly related to national sec ...
, the executive department 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 The president of the United States (POTUS) is the head of state and head of government of the United States of America. The president directs the executive branch of the federal government and is the commander-in-chief of the United States ...
, who is the commander-in-chief. This position corresponds to what is generally known as a
defense minister A defence minister or minister of defence is a cabinet official position in charge of a ministry of defense, which regulates the armed forces in sovereign states. The role of a defence minister varies considerably from country to country; in s ...
in many other countries. The secretary of defense is appointed by the president with the
advice and consent Advice and consent is an English phrase frequently used in enacting formulae of bills and in other legal or constitutional contexts. It describes either of two situations: where a weak executive branch of a government enacts something prev ...
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 Civilian control of the military is a doctrine in military and political science that places ultimate responsibility for a country's strategic decision-making in the hands of the civilian political leadership, rather than professional 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 Reserve or reserves may refer to: Places * Reserve, Kansas, a US city * Reserve, Louisiana, a census-designated place in St. John the Baptist Parish * Reserve, Montana, a census-designated place in Sheridan County * Reserve, New Mexico, a US vi ...
) without a waiver from Congress. Subject only to the orders of the president, the secretary of defense is in the
chain of command A command hierarchy is a group of people who carry out orders based on others' authority within the group. It can be viewed as part of a power structure, in which it is usually seen as the most vulnerable and also the most powerful part. Milit ...
and exercises
command and control Command and control (abbr. C2) is a "set of organizational and technical attributes and processes ... hatemploys human, physical, and information resources to solve problems and accomplish missions" to achieve the goals of an organization or en ...
, for both operational and administrative purposes, over all service branches administered by the Department of Defensethe
Army An army (from Old French ''armee'', itself derived from the Latin verb ''armāre'', meaning "to arm", and related to the Latin noun ''arma'', meaning "arms" or "weapons"), ground force or land force is a fighting force that fights primarily on ...
,
Marine Corps Marines, or naval infantry, are typically a military force trained to operate in littoral zones in support of naval operations. Historically, tasks undertaken by marines have included helping maintain discipline and order aboard the ship (refl ...
,
Navy A navy, naval force, or maritime force is the branch of a nation's armed forces principally designated for naval and amphibious warfare; namely, lake-borne, riverine, littoral, or ocean-borne combat operations and related functions. It in ...
,
Air Force An air force – in the broadest sense – is the national military branch that primarily conducts aerial warfare. More specifically, it is the branch of a nation's armed services that is responsible for aerial warfare as distinct from an ...
, 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 A coast guard or coastguard is a maritime security organization of a particular country. The term embraces wide range of responsibilities in different countries, from being a heavily armed military force with customs and security duties to ...
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 eleven
Unified Combatant Command 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 ...
s. 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 state, the
secretary of the treasury The United States secretary of the treasury is the head of the United States Department of the Treasury, and is the chief financial officer of the federal government of the United States. The secretary of the treasury serves as the principal a ...
, the secretary of defense, and the attorney general 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 A general officer is an officer of high rank in the armies, and in some nations' air forces, space forces, and marines or naval infantry. In some usages the term "general officer" refers to a rank above colonel."general, adj. and n.". OED ...
Lloyd Austin 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 ...
, 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 American Revolution was an ideological and political revolution that occurred in British America between 1765 and 1791. The Americans in the Thirteen Colonies formed independent states that defeated the British in the American Revoluti ...
. The
War Department 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 ...
, headed by the
secretary of war The secretary of war was a member of the U.S. president's Cabinet, beginning with George Washington's administration. A similar position, called either "Secretary at War" or "Secretary of War", had been appointed to serve the Congress of the ...
, 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 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 ...
in 1798. Based on the experiences of
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing ...
, 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 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 ...
to a newly established
National Military Establishment The United States Department of Defense (DoD, USDOD or DOD) is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government directly related to national secur ...
(NME). The Act also separated the Army Air Forces from the Army to become its own branch of service, the
United States Air Force The United States Air Force (USAF) is the Aerial warfare, air military branch, service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part ...
. 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 James Vincent Forrestal (February 15, 1892 – May 22, 1949) was the last Cabinet-level United States Secretary of the Navy and the first United States Secretary of Defense. Forrestal came from a very strict middle-class Irish Catholic fami ...
, who in his previous capacity as the
secretary of the Navy The secretary of the Navy (or SECNAV) is a statutory officer () and the head (chief executive officer) of the Department of the Navy, a military department (component organization) within the United States Department of Defense. By law, the se ...
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 Interservice rivalry is the rivalry between different branches of a country's armed forces, in other words the competition for limited resources among a nation's land, naval, coastal, air, and space forces. The term also applies to the rival ...
, directly subordinate the secretaries of the Army, the Navy and the
Air Force An air force – in the broadest sense – is the national military branch that primarily conducts aerial warfare. More specifically, it is the branch of a nation's armed services that is responsible for aerial warfare as distinct from an ...
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 deputy secretary of defense (acronym: DepSecDef) is a statutory office () and the second-highest-ranking official in the Department of Defense of the United States of America. The deputy secretary is the principal civilian deputy to the sec ...
, 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 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 George Catlett Marshall Jr. (December 31, 1880 – October 16, 1959) was an American army officer and statesman. He rose through the United States Army to become Chief of Staff of the United States Army, Chief of Staff of the US Army under Pre ...
in 1950, Marine Corps General
Jim Mattis James Norman Mattis (born September 8, 1950) is a retired United States Marine Corps four-star general who served as the 26th US secretary of defense from 2017 to 2019. During his 44 years in the Marine Corps, he commanded forces in the Persia ...
in 2017, and retired Army general Lloyd J. Austin III in 2021.


Powers and functions

The secretary of defense, appointed by the
president President most commonly refers to: *President (corporate title) * President (education), a leader of a college or university * President (government title) President may also refer to: Automobiles * Nissan President, a 1966–2010 Japanese ...
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 A constitution is the aggregate of fundamental principles or established precedents that constitute the legal basis of a polity, organisation or other type of entity and commonly determine how that entity is to be governed. When these princ ...
vests all military authority in
Congress A congress is a formal meeting of the representatives of different countries, constituent states, organizations, trade unions, political parties, or other groups. The term originated in Late Middle English to denote an encounter (meeting of ...
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 The secretary of the Navy (or SECNAV) is a statutory officer () and the head (chief executive officer) of the Department of the Navy, a military department (component organization) within the United States Department of Defense. By law, the se ...
, and
secretary of the Air Force A secretary, administrative professional, administrative assistant, executive assistant, administrative officer, administrative support specialist, clerk, military assistant, management assistant, office secretary, or personal assistant is a wh ...
, Army chief of staff, commandant of the Marine Corps, chief of naval operations,
Air Force chief of staff The chief of staff of the Air Force (acronym: CSAF, or AF/CC) is a statutory office () held by a general in the United States Air Force, and as such is the principal military advisor to the secretary of the Air Force on matter pertaining to th ...
,
chief of space operations The chief of space operations (CSO) is the service chief of the United States Space Force. The CSO is the principal military adviser to the secretary of the Air Force for Space Force operations and, as a member of the Joint Chiefs of Staff, a m ...
, and
chief of the National Guard Bureau The chief of the National Guard Bureau (CNGB) is the highest-ranking officer of the National Guard and the head of the National Guard Bureau. The position is a statutory office (), held by a federally recognized commissioned officer who has serv ...
and the combatant commanders of the
Combatant Command 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, ...
s. 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 The Joint Chiefs of Staff (JCS) is the body of the most senior uniformed leaders within the United States Department of Defense, that advises the president of the United States, the secretary of defense, the Homeland Security Council and the ...
(JCS) and the
Joint Staff The Joint Chiefs of Staff (JCS) is the body of the most senior uniformed leaders within the United States Department of Defense, that advises the president of the United States, the secretary of defense, the Homeland Security Council and the ...
(JS),
Office of the Inspector General In the United States, Office of Inspector General (OIG) is a generic term for the oversight division of a federal or state agency aimed at preventing inefficient or unlawful operations within their parent agency. Such offices are attached to ma ...
(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 (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 ...
(DON) &
Department of the Air Force The United States Department of the Air Force (DAF) is one of the three military departments within the Department of Defense of the United States of America. The Department of the Air Force was formed on September 18, 1947, per the National Sec ...
(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 Robert Michael Gates (born September 25, 1943) is an American intelligence analyst and university president who served as the 22nd United States secretary of defense from 2006 to 2011. He was originally appointed by president George W. Bush a ...
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 The deputy secretary of defense (acronym: DepSecDef) is a statutory office () and the second-highest-ranking official in the Department of Defense of the United States of America. The deputy secretary is the principal civilian deputy to the sec ...
(DEPSECDEF) and five under secretaries of defense in the fields of acquisition & sustainment, research & engineering, comptroller/chief financial officer,
intelligence Intelligence has been defined in many ways: the capacity for abstraction, logic, understanding, self-awareness, learning, emotional knowledge, reasoning, planning, creativity, critical thinking, and problem-solving. More generally, it can be des ...
, personnel & readiness, and
policy Policy is a deliberate system of guidelines to guide decisions and achieve rational outcomes. A policy is a statement of intent and is implemented as a procedure or protocol. Policies are generally adopted by a governance body within an orga ...
; 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 The Joint Chiefs of Staff (JCS) is the body of the most senior uniformed leaders within the United States Department of Defense, that advises the president of the United States, the secretary of defense, the Homeland Security Council and the ...
(JS).


Awards and decorations

The
Defense Distinguished Service Medal The Defense Distinguished Service Medal is a military decoration of the United States Department of Defense, which is presented to United States Armed Forces service members for exceptionally distinguished performance of duty contributing to the ...
(DDSM), the Defense Superior Service Medal (DSSM), the
Defense Meritorious Service Medal The Defense Meritorious Service Medal (DMSM) is an award bestowed upon members of the United States military by the United States Department of Defense. In the order of precedence of the United States Armed Forces, it is worn between the Purple ...
(DMSM), the
Joint Service Commendation Medal The Commendation Medal is a mid-level United States military decoration presented for sustained acts of heroism or meritorious service. Each branch of the United States Armed Forces issues its own version of the Commendation Medal, with a fifth ...
(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 The Joint Meritorious Unit Award (JMUA) is a US military award that was established on June 4, 1981, by Secretary of Defense Caspar Weinberger and was implemented by Department of Defense Directive 1348.27 dated July 22, 1982. The Joint Meritor ...
(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 Air Force Distinguished Service Medal (AFDSM) is a military decoration of the United States Air Force and United States Space Force and is presented to airmen and guardians to recognize distinguished and exceptionally meritorious service to ...
), the DSSM corresponds to the Legion of Merit, the DMSM to the
Meritorious Service Medal A Meritorious Service Medal is an award presented to denote acts of meritorious service, and sometimes gallantry, that are worthy of recognition. Notable medals with similar names include: * Meritorious Civilian Service Award *Meritorious Service Me ...
, 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 The Medal of Honor (MOH) is the United States Armed Forces' highest military decoration and is awarded to recognize American soldiers, sailors, marines, airmen, guardians and coast guardsmen who have distinguished themselves by acts of valo ...
(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 The under secretary of defense for personnel and readiness, or USD (P&R) is a high-ranking civilian position in the Office of the Secretary of Defense (OSD) within the United States Department of Defense responsible for advising the secretary an ...
, 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 A congress is a formal meeting of the representatives of different countries, constituent states, organizations, trade unions, political parties, or other groups. The term originated in Late Middle English to denote an encounter (meeting of ...
. The secretary of defense, with the concurrence of the secretary of state, is the approval authority for the acceptance and wear of
NATO The North Atlantic Treaty Organization (NATO, ; french: Organisation du traité de l'Atlantique nord, ), also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 member states – 28 European and two No ...
medals issued by the
secretary general of NATO The secretary general of NATO is the chief civil servant of the North Atlantic Treaty Organization (NATO). The officeholder is an international diplomat responsible for coordinating the workings of the alliance, leading NATO's international staff ...
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 The Committee on Armed Services (sometimes abbreviated SASC for ''Senate Armed Services Committee'') is a committee of the United States Senate empowered with legislative oversight of the nation's military, including the Department of Def ...
(SASC) and the
House Armed Services Committee The U.S. House Committee on Armed Services, commonly known as the House Armed Services Committee or HASC, is a standing committee of the United States House of Representatives. It is responsible for funding and oversight of the Department of De ...
(HASC), and the two appropriations committees, the
Senate Appropriations Committee The United States Senate Committee on Appropriations is a standing committee of the United States Senate. It has jurisdiction over all discretionary spending legislation in the Senate. The Senate Appropriations Committee is the largest committ ...
and the
House Appropriations Committee The United States House Committee on Appropriations is a committee of the United States House of Representatives that is responsible for passing appropriation bills along with its Senate counterpart. The bills passed by the Appropriations Commi ...
. For the DoD intelligence programs the
Senate Select Committee on Intelligence The United States Senate Select Committee on Intelligence (sometimes referred to as the Intelligence Committee or SSCI) is dedicated to overseeing the United States Intelligence Community—the agencies and bureaus of the federal government of ...
and the
House Permanent Select Committee on Intelligence The United States House Permanent Select Committee on Intelligence (HPSCI), also known as the House Intelligence Committee, is a committee of the United States House of Representatives, currently chaired by Adam Schiff. It is the primary committ ...
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 A vice president, also director in British English, is an officer in government or business who is below the president (chief executive officer) in rank. It can also refer to executive vice presidents, signifying that the vice president is on ...
, 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 The secretary of the Navy (or SECNAV) is a statutory officer () and the head (chief executive officer) of the Department of the Navy, a military department (component organization) within the United States Department of Defense. By law, the se ...
, and
secretary of the Air Force A secretary, administrative professional, administrative assistant, executive assistant, administrative officer, administrative support specialist, clerk, military assistant, management assistant, office secretary, or personal assistant is a wh ...
), and the
secretary of homeland security The United States secretary of homeland security is the head of the United States Department of Homeland Security, the federal department tasked with ensuring public safety in the United States. The secretary is a member of the Cabinet of the U ...
(when the
United States Coast Guard The United States Coast Guard (USCG) is the maritime security, search and rescue, and law enforcement service branch of the United States Armed Forces and one of the country's eight uniformed services. The service is a maritime, military, mu ...
is under the
United States Department of Homeland Security The United States Department of Homeland Security (DHS) is the U.S. federal executive department responsible for public security, roughly comparable to the interior or home ministries of other countries. Its stated missions involve anti-terr ...
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 ...
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 Military justice (also military law) is the legal system (bodies of law and procedure) that governs the conduct of the active-duty personnel of the armed forces of a country. In some nation-states, civil law and military law are distinct bodie ...
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 Robert Strange McNamara (; June 9, 1916 – July 6, 2009) was an American business executive and the eighth United States Secretary of Defense, serving from 1961 to 1968 under Presidents John F. Kennedy and Lyndon B. Johnson. He remains the ...
, 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 Elliot Lee Richardson (July 20, 1920December 31, 1999) was an American lawyer and public servant who was a member of the cabinet of Presidents Richard Nixon and Gerald Ford. As U.S. Attorney General, he was a prominent figure in the Watergat ...
, 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 of the
Watergate Scandal The Watergate scandal was a major political scandal in the United States involving the administration of President Richard Nixon from 1972 to 1974 that led to Nixon's resignation. The scandal stemmed from the Nixon administration's contin ...
. (This is not counting deputy secretaries of defense William P. Clements 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 The United States secretary of the treasury is the head of the United States Department of the Treasury, and is the chief financial officer of the federal government of the United States. The secretary of the treasury serves as the principal a ...
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 Executive Order 13963. The order of succession is:


See also


References


Citations


General sources


Federal law

*
Title 10 of the United States Code Title 10 of the United States Code outlines the role of armed forces in the United States Code. It provides the legal basis for the roles, missions and organization of each of the services as well as the United States Department of Defense. Ea ...
*
Title 50 of the United States Code Title 50 of the United States Code outlines the role of War and National Defense in the United States Code. * : Council of National Defense * : Board of Ordnance and Fortification (repealed) * : Alien Enemies * : Espionage (repealed/transferred ...


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 Defence ministers