Lineage. Established as 55 Pursuit Group (Interceptor) on 20 Nov 1940. Activated on 15 Jan 1941. Redesignated: 55 Pursuit Group (Interceptor) (Twin Engine) on 31 Jan 1942; 55 Fighter Group (Twin Engine) on 15 May 1942; 55 Fighter Group, Twin Engine, on 1 Mar 1944; 55 Fighter Group, c. 19 Jul