509th Fighter-Interceptor Squadron

509th Tactical Fighter Squadron
Emblem of the 509th Tactical Fighter Squadron
Active	1943–1992
Country	United States
Branch	United States Air Force
Type	Tactical Fighter

The 509th Tactical Fighter Squadron is an inactive United States Air Force unit. It was last assigned to the 10th Tactical Fighter Wing, stationed at RAF Alconbury, England. It was inactivated on 30 December 1992.

Established as a dive-bomber squadron in early 1943, trained under Third Air Force with A-24 Banshees (the USAAF version of the Navy Douglas SBD Dauntless). Converted to a P-39 Airacobra squadron in August and finally into a P-47 Thunderbolt fighter squadron in late 1943.

Deployed to the European Theater of Operations (ETO), being assigned to IX Fighter Command in England in early 1944. Engaged in ground attacks of enemy fortifications; controlled bridges, railway lines, roads, armor and troop concentrations in Occupied France and the Low Countries; carrying out fighter sweeps of Luftwaffe-controlled airfields. Flew patrols over the Normandy Landing Beaches, 6 June 1944, later taking up station in newly constructed airfields in liberated areas of France. Engaged and completely destroyed a German armored division near Avranches, France, 29 July 1944. After immobilizing leading and trailing elements of the 3 mile (4.8 km) long column, the rest of the tanks and trucks were systematically destroyed with multiple sorties.

After the breakout at St Lo; squadron's mission was to provide air support in advance of the United States Third Army as it moved eastward across France, and as part of the Western Allied invasion of Germany in March 1945. Continued attacking ground targets until German Capitulation in May 1945. Gradually demobilized as part of the United States Air Forces in Europe occupation forces during the summer of 1945, inactivated in the United States as an administrative unit in October.