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United States Department of Defense

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United States Department of Defense
NameUnited States Department of Defense
Logo width200
Formed18 September 1947
Preceding1United States Department of War
Preceding2United States Department of the Navy
JurisdictionFederal government of the United States
HeadquartersThe Pentagon, Arlington County, Virginia
Employees~2.86 million (2023)
Budget$842 billion (FY2024)
Minister1 nameLloyd Austin
Minister1 titleUnited States Secretary of Defense
Chief1 nameGeneral Charles Q. Brown Jr.
Chief1 titleChairman of the Joint Chiefs of Staff
Chief2 nameKathleen Hicks
Chief2 titleUnited States Deputy Secretary of Defense
Websitedefense.gov

United States Department of Defense. The United States Department of Defense is the federal executive department responsible for coordinating and supervising all agencies and functions of the United States Armed Forces. Headquartered at The Pentagon in Arlington County, Virginia, it is the nation's largest employer and one of the most complex organizations in the world. Its primary mission is to provide the military forces needed to deter war and ensure the security of the United States.

History

The department was established by the National Security Act of 1947, which was signed into law by President Harry S. Truman. This landmark legislation reorganized the United States Armed Forces by merging the United States Department of War and the United States Department of the Navy into a single National Military Establishment, which was renamed the Department of Defense in 1949. Key historical developments include the Key West Agreement of 1948, which defined service roles, and the Goldwater–Nichols Act of 1986, which fundamentally restructured military command. The department has been central to major conflicts including the Korean War, the Vietnam War, the Gulf War, and the War in Afghanistan (2001–2021).

Organization

The department is organized under the United States Secretary of Defense, a civilian who reports directly to the President of the United States. Its structure is defined by the United States Code, Title 10, and includes three military departments: the United States Department of the Army, the United States Department of the Navy, and the United States Department of the Air Force. The Joint Chiefs of Staff, led by the Chairman of the Joint Chiefs of Staff, serves as the principal military advisory body. Operational command flows through the Unified Combatant Commands, such as United States Central Command and United States Indo-Pacific Command.

Leadership

Civilian leadership is vested in the United States Secretary of Defense, a member of the United States Cabinet and the National Security Council. The current secretary is Lloyd Austin, a former commander of United States Central Command. The principal deputy is the United States Deputy Secretary of Defense, Kathleen Hicks. The senior military officer is the Chairman of the Joint Chiefs of Staff, Charles Q. Brown Jr., a former Chief of Staff of the United States Air Force. Other key leaders include the Secretary of the Army, Secretary of the Navy, and Secretary of the Air Force.

Budget

The department's budget, known as the United States Department of Defense budget, is the largest discretionary spending account in the Federal government of the United States. The Fiscal Year 2024 budget request was approximately $842 billion, funding personnel, operations, maintenance, and procurement of advanced systems like the F-35 Lightning II and Gerald R. Ford-class aircraft carrier. The budget is authorized annually by the United States Congress through the National Defense Authorization Act and appropriations bills managed by the United States House Committee on Appropriations.

Functions and responsibilities

Its core function is to maintain and deploy the United States Armed Forces to protect national security interests. This includes deterring adversaries, conducting military operations, and providing support for civil authorities under the Insurrection Act of 1807. The department also engages in extensive research and development through agencies like the Defense Advanced Research Projects Agency (DARPA) and manages the National Security Agency (NSA) for signals intelligence. It plays a key role in international alliances such as NATO and security partnerships across the Indo-Pacific.

Major components

The major components include the three military departments, which manage their respective services: the United States Army, United States Marine Corps, United States Navy, United States Air Force, and United States Space Force. The department also oversees numerous defense agencies, including the Defense Intelligence Agency (DIA), the National Geospatial-Intelligence Agency (NGA), and the Missile Defense Agency (MDA). Key field activities include the Defense Logistics Agency and the Defense Health Agency, which provide critical support services across the entire force.

Category:United States Department of Defense Category:1947 establishments in the United States Category:National Security Act of 1947