Lineage. Constituted 50 Pursuit Squadron (Fighter) on 20 Nov 1940. Activated on 15 Jan 1941. Redesignated: 50 Fighter Squadron (Twin Engine) on 15 May 1942; 50 Fighter Squadron, Two Engine, on 28 Feb 1944. Disbanded on 9 Aug 1944. Reconstituted, and redesignated 50 Fighter Squadron (All Weather), on