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29th November 1941: Members of the American Eagle Squadron relaxing after patrol duties. They are in Britain as units of RAF Fighter Command patrolling the coast and carrying out offensives over northern Europe. (Photo by Keystone/Getty Images)

29th November 1941:  Members of the American Eagle Squadron relaxing after patrol duties. They are in Britain as units of RAF Fighter Command patrolling the coast and carrying out offensives over northern Europe.  (Photo by Keystone/Getty Images)

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First Officer 'Red' Tobin sits in the cockpit of his Hurricane fighter plane. He is part of the famous 'Eagle' Volunteer Air Squadron, which has joined the ranks of the Royal Air Force following stiff preparation. (Photo by PNA_Rota/Getty Images)

First Officer 'Red' Tobin sits in the cockpit of his Hurricane fighter plane. He is part of the famous 'Eagle' Volunteer Air Squadron, which has joined the ranks of the Royal Air Force following stiff preparation.   (Photo by PNA_Rota/Getty Images)

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Americans In Britain: The Work Of No 121 (Eagle) Squadron RAF, Rochford, Essex, August 1942, In the Pilots' Dispersal Hut at Rochford airfield, personnel of No 121 (Eagle) Squadron play Poker as they await the order to 'scramble'. Left to right they are: Pilot Officer Beatie (standing, from Georgia), Pilot Officer Heppel (New Jersey), Pilot Officer Kearney (New Mexico), Flight Sergeant Blandy (South Carolina), Flight Sergeant Carpenter (standing, from Pennsylvania), Flight Officer Hasey (Oklahoma), Flight Sergeant Sanders (Tennessee) and Flight Sergeant Vance (Virginia). In the rear right-hand corner of the photograph, the telephonist can be seen, along with several other personnel awaiting the call to action, August 1942. (Photo by Ministry of Information Photo Division Photographer/ IWM via Getty Images)

Americans In Britain: The Work Of No 121 (Eagle) Squadron RAF, Rochford, Essex, August 1942, In the Pilots' Dispersal Hut at Rochford airfield, personnel of No 121 (Eagle) Squadron play Poker as they await the order to 'scramble'. Left to right they are: Pilot Officer Beatie (standing, from Georgia), Pilot Officer Heppel (New Jersey), Pilot Officer Kearney (New Mexico), Flight Sergeant Blandy (South Carolina), Flight Sergeant Carpenter (standing, from Pennsylvania), Flight Officer Hasey (Oklahoma), Flight Sergeant Sanders (Tennessee) and Flight Sergeant Vance (Virginia). In the rear right-hand corner of the photograph, the telephonist can be seen, along with several other personnel awaiting the call to action, August 1942. (Photo by Ministry of Information Photo Division Photographer/ IWM via Getty Images)

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Members of the 2nd Eagle Squadron, formed of American volunteer pilots, in Britain during World War II, 29th November 1941. As a unit of RAF Fighter Command, they protect convoys off the British coast, and carry out offensive operations over the Channel and northern France. From left to right, intelligence officer Sir Duff Assheton-Smith receives a report from Squadron Leader Powell, Daley, Kennard, Skinner and Martin, with Patterson standing on the wing. (Photo by Keystone/Hulton Archive/Getty Images)

Members of the 2nd Eagle Squadron, formed of American volunteer pilots, in Britain during World War II, 29th November 1941. As a unit of RAF Fighter Command, they protect convoys off the British coast, and carry out offensive operations over the Channel and northern France. From left to right, intelligence officer Sir Duff Assheton-Smith receives a report from Squadron Leader Powell, Daley, Kennard, Skinner and Martin, with Patterson standing on the wing. (Photo by Keystone/Hulton Archive/Getty Images)

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18th March 1941: A member of the American 'Eagle' Volunteer Air Squadron runs to his Hurricane during an alarm. (Photo by Topical Press Agency/PNA Rota/Getty Images)

18th March 1941:  A member of the American 'Eagle' Volunteer Air Squadron runs to his Hurricane during an alarm.  (Photo by Topical Press Agency/PNA Rota/Getty Images)