I just saw the movie Rescue Dawn, about a German-American, named Dieter Dengler, who was taken prisoner by the Vietnamese in 1965. It's a great movie, by one of my favorite directors, Werner Herzog. Werner Herzog also made a documentary in 1997 about Dieter, called Little Dieter Needs to Fly, which I haven't seen, but now I want to.
You should go into the movie with the understanding that it is a fictionalized account of what happened. What that means to me, is that events and characters were altered. Some say distorted. After you see the movie, you should check out Rescue Dawn: The Truth, which is a Web site where the folks who know the real story reveal some details which will change your perception of the characters in the film.