United States Department of Defense
"DoD" redirects here. For other uses, see DOD. United States Department of Defense Department overview Formed September 18, 1947 ; 70 years ago ( 1947-09-18 ) (as National Military Establishment) Preceding Department U.S. Department of the Army U.S. Department of the Navy U.S. Department of the Air Force Type Executive Department Headquarters The Pentagon Arlington County, Virginia, United States 38°52′16″N 77°3′21″W / 38.87111°N 77.05583°W / 38.87111; -77.05583 Coordinates: 38°52′16″N 77°3′21″W / 38.87111°N 77.05583°W / 38.87111; -77.05583 Employees 742,000 (civilian) 1,300,000 (active duty military) 826,000 (National Guard and reserve): 2.87 million total [1] (2016) Annual budget US$530.1 billion (2010) [2] US$549.1 billion (2011) [3] US$553.0 billion (est. 2012) US$496.1 billion (2015) [4] US$534.3 billion (base FY2016) [4] Department executives Jim Mattis, Secretary Patrick M. Shanahan, Deputy Secretary Child agencies U.S. Department of the Army U.S. Depa...