第20爆撃集団
XX Bomber Command conducted its first combat operation on 5 June 1944. On this day, 98 B-29s were dispatched from bases in India to attack targets in Bangkok, Thailand, as a 'dress rehearsal' for more ambitious operations against Japan and targets in South East Asia. Although little damage was done and five B-29s were lost to flying accidents and technical faults, the operation was rated a success by XX Bomber Command, as it provided useful combat experience for the bomber crews, as well as data on how the B-29 performed in action.