A reorganization of United States military commands on 16 July 1945 placed Twentieth Air Force under the command and control of the new United States Strategic Air Forces in the Pacific. Twentieth Air Force would command B-29 wings directly based in the Mariana Islands, while the newly re-deployed Eighth Air Force would command B-29 wings based on Okinawa. This realignment was made in advance of the planned Invasion of Japan (Operation Downfall) set to begin in October 1945. XXI Bomber Command was inactivated, its organization under the direct control of Twentieth Air Force.