Activated in early 1942 as a B-24 Liberator Operational Training Unit (OTU), later becoming a Replacement Training Unit (RTU) for deployed combat units, assigned to II Bomber Command. Inactivated in April 1944 when heavy bomber training ended. Redgesignated as a B-29 Superfortress very heavy bombardment Squadron under Second Air Force on 1 April 1944 at Dalhart Army Airfield, Texas. Initially equipped with B-17 Flying Fortresses for training, due to shortage of B-29 Superfortresses. Moved to Harvard Army Airfield, Nebraska, in August 1944 and equipped with B-29B limited production aircraft.