US Defense Department

26722 Plaza
Mission Viejo CA 92691
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Operational since 1775, the U.S. Department of Defense is one of the largest government agencies in the United States and consists of the Army, Navy, and Marine Corps, along with the U.S. Air Force and the Coast Guard. Based in Viejo, Calif., it is headed by the Secretary of Defense and is in charge of the military as well as a civilian force of several communities. The department is in charge of defense installations and facilities and capacities to protect resources and manages an inventory of installations and facilities.