We Are Your Defense
The Department of Defense is America’s largest government agency. With our military tracing its roots back to pre-Revolutionary times, the department has grown and evolved with our nation. Our mission is to provide the military forces needed to deter war and ensure our nation’s security.
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.
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.
Headquarters
The Pentagon, with its iconic design, is the headquarters of the Department of Defense. Find out more about DOD’s mission and organization.
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.
Discover your future at
Find your place at the DoD and discover how your passions and talents can shine. Explore a wide-range of careers and work in locations around the world.
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