Activated on 15 November 1942 at
Hamilton Field,
California, initially equipped with
P-39 Airacobras and assigned to
IV Fighter Command for training. Moved to several bases in California and Nevada then to
Portland Army Air Base, Oregon, in June 1943 and re-equipped with new
P-51B Mustangs. Transitioned to the Mustang throughout the summer of 1943 the deployed to the
European Theater of Operations (ETO), being assigned to
IX Fighter Command in England. In late 1943, the strategic bombardment campaign over
Occupied Europe and
Nazi Germany being conducted by
VIII Bomber Command was taking heavy losses in aircraft and flight crews as the
VIII Fighter Command's
P-38 Lightnings and
P-47 Thunderbolts lacked the range to escort the heavy
B-17 Flying Fortress and
B-24 Liberator bombers deep into Germany to attack industrial and military targets. The P-51 had the range to perform the escort duties and the unit's operational control was transferred to Headquarters,
Eighth Air Force to perform escort missions. From its base at
RAF Boxted, the unit flew long-range strategic escort missions with VIII Bomber Command groups, escorting the heavy bombers to targets such as Frankfurt, Leipzig, Augsburg, and Schweinfurt, engaging
Luftwaffe day interceptors frequently, with the P-51s outperforming the German
Bf 109 and
Fw 190 interceptors, causing heavy losses to the Luftwaffe. Remained under operational control of Eighth Air Force until April 1944, when sufficient numbers of P-51D Mustangs and arrived from the United States and were assigned to VIII Fighter Command units for escort duty. Was relieved from escort duty and was re-equipped with
P-47D Thunderbolts, and reassigned to
RAF Lashenden on the southern coast of England. Mission was redefined to provide tactical air support for the forthcoming invasion of France, to support the Third, and later Ninth United States Armies. Flew fighter sweeps over
Normandy and along the
English Channel coast of France and the
Low Countries, April–June 1944, then engaged in heavy tactical bombing of enemy military targets as well as roads, railroads and bridges in the Normandy area to support ground forces in the immediate aftermath of
D-Day. Moved to
Advanced Landing Grounds in France beginning at the end of June, 1944, moving eastwards to combat airfields and liberated French airports supporting Allied Ground forces as the advanced across Northern France. Later, in 1944, the squadron became involved in dive-bombing and strafing missions, striking railroad yards, bridges, troop concentrations, and airfields. Participated in attacks on German forces in Belgium in the aftermath of the
Battle of the Bulge, then moved eastward as part of the
Western Allied invasion of Germany. The squadron flew its last mission of the war on 7 May 1945 from the captured Luftwaffe airfield at
Ansbach (R-45). Remained in Occupied Germany as part of the
United States Air Forces in Europe XII Tactical Air Command occupying force after the German Capitulation, being stationed at
AAF Station Herzogenaurach. Was inactivated on 31 March 1946. == Cold War ==