 In May 1944, the OKL confronted a further major challenge; how to bolster Luftflotte Reich while building up strength for the Allied invasion of France, expected that summer.Luftflotte 3 was responsible for stocking airfields, and preparing for the stream of reinforcements from Luftflotte Reich once the invasion started.JG 2 and JG 26 were expected to form the mainstay of the German fighter defence in the initial phase.