Lineage. Constituted as 39 Bombardment Squadron, Very Heavy, on 28 Mar 1944. Activated on 1 Apr 1944. Inactivated on 18 Oct 1948. Redesignated as 39 Bombardment Squadron, Medium, on 20 Dec 1950. Activated on 2 Jan 1951. Redesignated as 39 Bombardment Squadron, Heavy, on 16 Jun 1952.