Lineage. Constituted as 351 Bombardment Squadron (Heavy) on 28 Jan 1942. Activated on 1 Jun 1942. Redesignated as 351st Bombardment Squadron, Heavy, on 20 Aug 1943. Inactivated on 15 Dec 1945. Redesignated as 351 Bombardment Squadron, Very Heavy, on 3 Jul 1947. Activated in the Reserve on 17 Jul