Jimmy Stewart
Jimmy Stewart was a big enough movie star that he didn’t have to enlist after Pearl Harbor, but he did it out of a sense of duty. After joining the Air Force, Stewart worried that they would give him special treatment because of his fame.
Stewart appealed to his commander directly and got sent to England, where he eventually flew 20 combat missions. He served in various capacities until 1968, by which time he’d become the highest ranking actor in the history of the U.S. Armed Forces.