Air Force, US

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Air Force, US (USAF) One of the three major US military services established under the Department of Defense in the National Security Act of 1947. It began as the Aeronautical Division of the Army in 1907, became the Aviation Section of the Signal Corps in 1914, the Air Service in 1918, the Army Air Corps in 1926, and the Army Air Forces in 1941. It is the world's largest air force. Total personnel (1998): 382,200.

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