John-Wayne-Green-Beret-movie-Vietnam

John Wayne and David Janssen starred in a 1968 film loosely based on Moore’s book. Wayne portrayed Col. Mike Kirby, and Janssen was skeptical reporter George Beckworth, who becomes a supporter of the American war effort by the end of the movie. The film won over audiences but not critics. (Bettman/Getty Images)

Bettman/Getty Images