The Department of Defense (also known as the Defense Department, USDOD, DOD, DoD or the Pentagon) is the Executive Department of the Government of the United States of America charged with coordinating and supervising all agencies and functions of the government concerned directly with national security and the United States armed forces. The Department is also the largest employer in the world, with more than 2.13 million active duty Soldiers, Sailors, Marines, Airmen, and also civilian workers, and over 1.1 million National Guardsmen and members of the Army, Navy, Air Force, and Marine Reserves. The grand total is just over 3.2 million servicemen and servicewomen, plus the civilians who support them. The Department headed by the Secretary of Defense has three subordinate military departments: the Department of the Army, the Department of the Navy, and the Department of the Air Force.
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