The mission of the Marietta Army Airfield was acceptance testing of B-29 Superfortress heavy bombers for the USAAF, the modification of B-29s, and the operation of an Army Air Depot. Barracks for the soldiers reached completion in November 1943. By January 1, 1944, the number of soldiers stationed here had risen to 73 officers and 1,263 enlisted men. For a period of time, the Marietta Army Airfield was assigned to the USAAF's Second Air Force under the XX Bomber Command. On 12 April 1944, the Marietta Army Airfield was reassigned to the "17th Bombardment Operation Training Unit".