Supermarine Spitfire. American Users, part six. The Spitfire in USAAF service. Part two, some USAAF squadrons.

 

 The United States Army Air Forces (USAAF) also employed the Supermarine Spitfire in some units, such as the following ones:

• 307th Fighter Squadron: This squadron was deployed from the 3rd Air Force to the 8th Air Force in June 1942, to take part in the European Theatre of Operations (ETO), where their P-39s and P-40 were deemed unsuitable, so they were equipped with the Spitfire Mk.V. As they were part of the 31st Fighter Group, their first combat action took place over occupied France on 18th August 1942, attacking enemy positions. 
  The squadron, together with the whole 31st Fighter Group was redeployed to Gibraltar to provide aerial support for Operation Torch and then to former Vichy France airfields in north-western Africa, namely Morocco and Algeria. 
  They served through both Tunisian, Sicilian campaigns and the advance into mainland Italy until 12th Air Force's bombers operations required longer range escorts to operate over Central Europe and the Balkans, so their Spitfires were replaced by P-51s in August 1944.
• 309th Fighter Squadron: This unit was initially deployed to the ETO in early 1942. It was equipped with Bell P-39 Aircobras and Curtiss P-40 Warhawks. However, as they were deemed unsuitable for that theatre, they were soon re-equipped with the Spitfire Mk.V, after a two months training for both mechanics and pilots after which they were rebased to south-east England, where, in August 1942, they flew their first combat mission over occupied France. 
  They were transferred in November to the 12th Air Force to provide aerial support in Operation Torch. Time, when they were based in Gibraltar and former Vichy-France airfields in north-western Africa. 
  They went through the Tunisian campaign, Sicily landings and the invasion of mainland Italy and, since 12th Air Force's bombers required longer range escorts in operations over Central Europe and the Balkans, the 309th Fighter Squadrons spitfires were replaced by P-51s in August 1944.
• 335th Fighter Squadron: This squadron was formed under Royal Air Force (RAF) command as No. 121 (Eagle) Squadron. The unit was transferred to the USAAF on 22nd August 1942 together with other Eagle squadrons and it was activated shortly after, on 12th September. It was assigned to the 4th Fighter Group of the 8th Air Force and it operated from Debden. The unit flew the Spitfire Mk.V until February 1943 when it was replaced by the P-47 Thunderbolt. 
• 336th Fighter Squadron: This formation was RAF's No.133 (Eagle) Squadron that was transferred to the USAAF on 22nd August 1942. They were initially equipped with the Spitfire Mk.V and were based at Debden, England where they flew the Spitfire until it was replaced by the P-47 Thunderbolt in April 1943.

Sources:

1st https://en.wikipedia.org/wiki/307th_Fighter_Squadron

2nd https://en.wikipedia.org/wiki/309th_Fighter_Squadron

3rd https://en.wikipedia.org/wiki/335th_Fighter_Squadron

4th https://en.wikipedia.org/wiki/336th_Fighter_Squadron

5th https://military-history.fandom.com/wiki/335th_Fighter_Squadron

6th https://military-history.fandom.com/wiki/336th_Fighter_Squadron