service in September 1947.

On 27 June 1949, the Air Force Reserve's 447th Bombardment Group was activated at Castle and equipped with the B-29s formerly of the 93d Bomb Wing. The 447th remained active until 16 June 1951 when the group was activated and the aircraft and personnel sent to Far East Air Forces as replacements for combat losses during the Korean War. With the unit's departure, the 447th was inactivated.