One of three Leicester brothers in the RAF, Derek Allen joined 85 Squadron as a Hurricane pilot in 1938. As a member of the British Expeditionary Force, his first air combat took place on May 10th 1940, during which he was credited with shooting down a Henschel reconnaissance plane and received a third of a credit for bringing down a Junkers 88. The next day he shared two kills, both Dornier bombers and on May 13 he was credited with shooting down two Heinkel fighters (although the Luftwaffe did not actually use these in combat in France). On May 15 he was shot down, his subsequent citation for the Distinguished Flying Cross stating: "After his aircraft had been severely damaged by anti-aircraft fire he didn't hesitate to attack a Junkers 87 over enemy territory and shot it down." Two days later he was back in combat and shot down and killed. Posted as Missing in Action, he had been buried as an unknown airman in a French church yard, and his body was not officially identified until 2012.