What was the designation given to the volunteer American pilots who assisted the RAF?

The designation given to the volunteer American pilots who assisted the Royal Air Force (RAF) during World War II was the Eagle Squadrons. These squadrons were formed before the United States entered the war and were composed of American pilots who wanted to combat the Axis powers. They played a significant role in the air battles over Europe, particularly in the Battle of Britain, demonstrating bravery and skill in their engagements.

The Eagle Squadrons were officially incorporated into the United States Army Air Forces as the 4th Fighter Group in 1942, which further emphasizes their contributions to the air defense of Britain and their operational significance in the early years of the war. The name itself reflects the patriotic spirit and the idea of these American volunteers flying under the banner of the RAF as they sought to support an ally against tyranny.