About Us
We Are Your Defense
The Department of Defense is America's largest government agency, committed to safeguarding the nation's security.
With roots tracing back to before the Revolutionary War, the Department of Defense has grown and evolved alongside our nation. Our primary mission is to provide the military forces necessary to deter war and ensure national security.
- $841.4 Billion – National Defense Budget
- 3.4 Million – Service Members & Civilians
- 4,800 Sites – Located in Over 160 Countries
Armed Forces
The U.S. Armed Forces include:
Army
Marine Corps
Navy
Air Force
Space Force
Coast Guard
National Guard
Combatant Commands
The Department of Defense oversees 11 combatant commands. Each command has either a geographic or functional focus, providing leadership and control of military forces during peace and conflict.
Leadership
Our leadership includes:
- Secretary of Defense: Hon. Pete Hegseth
- Deputy Secretary of Defense: Hon. Steve Feinberg
- Chairman, Joint Chiefs of Staff: Gen. Dan Caine (Air Force)
- Vice Chairman, Joint Chiefs of Staff: Adm. Christopher W. Grady (Navy)
Our History
The Department of Defense is America's oldest and most expansive government institution. From its beginnings before the Revolution to today’s global operations, the DOD has played a pivotal role in defending the nation and driving innovation.
The Pentagon
As the headquarters of the Department of Defense, the Pentagon is an architectural and symbolic landmark. Each year, over 100,000 visitors explore its historic halls and memorials with guided tours led by active-duty service members.