In June 1944, Gable was promoted to major. While he hoped for another combat assignment, he had been placed on inactive duty and on June 12, 1944, 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.