FUN FACT: Department of Defense
The United States Department of Defense (DoD), headquartered at the Pentagon, coordinates and supervies ALL agencies and functions directly related to national security and the U.S. Armed Forces --- Dept. of the Army, Dept. of the Navy, the Dept. of the Air Force, and four national intelligence services. The DoD is the largest employer in the world -- soldiers, marines, sailors, airmen, National Guard, military reservists, and over 732K civilians.
The DoD is headed by the secretary of defense, who reports directly to the president of the United States.