Department of Defense
The Department Of Defense, also known as the DOD, is the federal agency responsible for maintaining the national security of the United States. Its purpose is to co-ordinate Americas military armed forces in times of war and to plan for the nations defense in times of peace. The Department of Defense is one of the fourteen executive departments of the United States Government. ... The Department of Defenses was established by the National Security Act of 1949, following World War II. The act combined the Department of War and the Department of the Navy into a single department. This organization of the Department of Defense involves a complex relation between civilian and military personnel. They include the office of the Secretary, the Department of the Army, the Department of the Navy, the Department of the Air Force, the Joint Chiefs of Staff, the Unified and specified commands, and the Defense Agencies.