ダウンフォール作戦
A proposed British Commonwealth very long range (VLR) bomber group named "Tiger Force" was scaled down through the spring of 1945. Following VE Day on May 8, 1945, the RCAF units that were to be part of Tiger Force were converted to the Avro Lancaster and returned to Canada for training and reorganization as part of a planned Allied invasion of Japan (Operation Downfall).