Training at Columbia Army Air Base was phased down during the summer of 1945. Several units arrived at the base from overseas to inactivate during September and October. It was inactivated by the U.S. Army Air Forces on 30 November and returned to civil authorities, which converted it back to an airport. The 350th Bombardment Squadron was assigned to Columbia Metropolitan Airport on 16 July 1947 as part of the Air Force Reserve, but it was never equipped or manned; it was inactivated on 27 June 1949.