Lineage. Constituted as 421 Night Fighter Squadron on 30 Apr 1943. Activated on 1 May 1943. Inactivated on 20 Feb 1947. Redesignated as 421 Tactical Fighter Squadron, and activated, on 13 Apr 1962. Organized on 8 Jul 1962. Redesignated as 421 Fighter Squadron on 1 Nov 1991.Assignments. Air