 Blythe Army Air Field later became a sub-base of Muroc Army Air Field (now Edwards Air Force Base) on 30 June 1945, and was inactivated on 18 October 1945, although during October–December 1946, the 477th Composite Group (Medium) used the airfield for desert maneuvers, flying North American B-25 Mitchells.The airfield was declared surplus effective as of July 30, 1946, and was reported to the General Service Administration for disposal.On September 10, 1948, the entire 4,560-acre site was transferred to the County of Riverside via quitclaim deed dated September 10, 1948.