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The United States Department of Defense (United States Department of Defense) is a department under the federal government of the United States of America, referred to as DOD or DoD. Its headquarters is the Pentagon and its leader is the U.S. Secretary of Defense. According to U.S. law, ministers are civil servants. The U.S. Department of Defense was established on September 18, 1947, formerly known as the U.S. Department of War, and is headquartered in the Pentagon.