While John Wayne had been open about his frustration with having to play the same kinds of characters, his moral compass led him to turn down a different role in a classic war movie. John Wayne movies are a genre of their own, and he was such an immensely popular actor during the "Golden Age of Westerns" that he rarely played anyone other than the straight-shooting and heroic protagonist. Some of John Wayne's personal best roles are in the Western genre, where he got his career break, but he also appeared in some critically acclaimed war movies.