Lineage. Constituted as 343 Bombardment Squadron (Heavy) on 28 Jan 1942. Activated on 3 Feb 1942. Redesignated as 343 Bombardment Squadron,Very Heavy, on 23 May 1945. Inactivated on 27 Mar 1946. Activated on 1 Jul 1947. Redesignated as 343 Bombardment Squadron, Medium, on 28 May 1948. Discontinued,