Established as a Third Air Force A-20 Havoc light bomber Operational Training Unit in mid-1943; Deployed to European Theater of Operations (ETO) in mid-1944; assigned to Ninth Air Force in England. Entered combat in May 1944 and helped to prepare for the invasion of Normandy by assaulting coastal defenses, airfields, and V-weapon sites in France, and marshalling yards in France and Belgium. Supported the invasion in June by bombing gun positions and railway choke points. Assisted ground forces at Caen and St Lo in July and at Brest in August and September by attacking bridges, vehicles, fuel and ammunition dumps, and rail lines.