Lineage. Constituted 10th Bombardment Squadron (Heavy) on 22 Dec 1939. Activated on 1 Feb 1940. Redesignated: 10th Bombardment Squadron (Medium) on 7 May 1942; 10th Bombardment Squadron, Medium, on 21 Sep 1943. Inactivated on 17 Jun 1944. Redesignated 10th Bombardment Squadron, Light, on 11 Mar