$841.4 Billion
National Defense Budget
3.4 Million
Service Members & Civilians
4,800 Sites
In Over 160 Countries
Armed Forces
The Army, Marine Corps, Navy, Air Force, Space Force and Coast Guard are the armed forces of the United States. The Army National Guard and the Air National Guard are reserve components of their services and operate in part under state authority.
Combatant Commands
The Defense Department has 11 combatant commands, each with a geographic or functional mission that provides command and control of military forces in peace and war.Learn More
Leaders
Secretary of Defense
Lloyd J. Austin III
Deputy Secretary of Defense
Kathleen H. Hicks
Chairman of the Joint Chiefs of Staff
Air Force Gen.
Charles Q. Brown, Jr.
Vice Chairman of the Joint Chiefs of Staff
Navy Adm.
Christopher W. Grady
Office of the Secretary of Defense
Top civilian defense decision-makers work with the secretary to develop policy, operational and fiscal plans, manage resources and evaluate programs.
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Secretary Priorities
The Department of Defense is focused on the following areas:
Defend the Nation
Take Care of Our People
Succeed Through Teamwork
History
The Department of Defense is America’s oldest and largest government agency, tracing its roots back to pre-Revolutionary times. Learn about DOD’s rich history and innovations.Learn More
Headquarters
The Pentagon, with its iconic design, is the headquarters of the Department of Defense. Find out more about DOD’s mission and organization.Learn More
Take A Tour
Each year, about 100,000 visitors explore displays and memorials in the Pentagon’s halls with the help of tour guides, all of whom are active U.S. service members. Get more information about touring the Pentagon.Learn More