The 365th Fighter Group is an inactive United States Army Air Force unit. Its last assignment was with the Army Service Forces stationed at Camp Myles Standish, Massachusetts. It was inactivated on 22 September 1945.During World War II the unit was assigned to Ninth Air Force in England, flying its first combat mission on 22 February 1944. The 365th was one of the most successful P-47 groups of the Ninth Air Force when it came to air combat. It flew its last mission on 8 May 1945. I Fighter Command, 15 May 1943, Attached to: Philadelphia Fighter Wing, 19 July – 4 December 1943, 70th Fighter Wing, Attached to: IX Air Service Command, 22 December 1943, 84th Fighter Wing, Attached to: IX Tactical Air Command, 1 August 1944, 70th Fighter Wing, Attached to: IX Tactical Air Command, 1 October 1944, XIX Tactical Air Command, 16 January 1945, IX Tactical Air Command, 1 February – 11 September 1945. Army Service Forces (for inactivation), 20–22 September 1945. Components: 386th Fighter Squadron (D5), 15 May 1943 – 22 September 1945, 387th Fighter Squadron (B4), 15 May 1943 – 22 September 1945, 388th Fighter Squadron (C4), 15 May 1943 – 22 September 1945.