"Ford was disgusted by John Wayne's refusal to enlist in 1941. When Ford filmed They Were Expendable (1945) after World War II he included every actor's former military rank and branch (Ford himself was a Navy officer and combat photographer). Of course, there were no credentials behind Wayne's name, which the actor took as a real slap."
This is a well known bit of Hollywood history. Ford, btw, was 13 years older than Wayne and he went to war with a camera in his hand. And, Robert Montegomery, the star of the film, left a better Hollywood career than Wayne's and went to war where he skippered a PT Boat for real.
Wayne was nothing but an actor, putting him (or any celebrity) on a pedestal invites ridicule.
http://www.jodavidsmeyer.com/combat/military/actors_in_wwii.html
The first one is Don Adams (Maxwell Smart)!