In May 1944, Gable was promoted to major. He hoped for another combat assignment, but when the invasion of Normandy came and went in June without any further orders, Gable was relieved from active duty as a major on June 12, 1944, at his request, since he was over-age for combat. His discharge papers were signed by Captain (later U.S. President) Ronald Reagan. Gable completed editing of the film Combat America in September 1944, giving the narration himself and making use of numerous interviews with enlisted gunners as focus of the film. Because his motion picture production schedule made it impossible for him to fulfill reserve officer duties, he resigned his commission on September 26, 1947, a week after the Air Force became an independent service branch.

Gable's military awards were the Distinguished Flying Cross, Air Medal, American Campaign Medal, European-African-Middle Eastern Campaign Medal, and World War II Victory Medal. He also qualified for and received aerial gunner wings.

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