My dad, while in the RAF, was stationed on a field where the American Eagle Squadron was stationed.
While he was not assigned to the Eagle Squadron he did state that at times they would be sent over to help on the Spitfires.
Here I have found some art work done by Disney artists for the Eagle Squadron.
Over the course of the war, Disney artists designed more than 1,200 combat insignia for all branches of the US military and for its allies. Besides the famed Flying Tigers insignia, one of the most celebrated designs was made for England’s (UK's)Royal Air Force. Prior to Pearl Harbor, many American pilots joined England’s Royal Air Force as members of Eagle Squadrons 71, 121, and 133. An entry in a Hearst newspaper insignia stamp album stated, "Walt Disney artists were quick to chronicle the significance of this combat union with an American Eagle ‘on guard.’ Fiercely he advances to contest the fouling tactics of a barbarous and un-sportsmanlike adversary, as he moves in to the attack with his English ‘comrade-at-arms.’”