Activated in June 1943 as a heavy bombardment group. Trained with B-24 Liberators for duty overseas. Moved to Italy, December 1943 – January 1944. Began combat with Fifteenth Air Force in February 1944, operating chiefly against strategic targets until late in April 1945. Early operations included attacks against such objectives as marshalling yards, aircraft factories, railroad bridges, and airdromes in Italy, Austria, and Rumania. See 456th Bombardment Wing page for additional lineage and history