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Few people seem familiar with this 1978 film starring Burt Lancaster and Craig Wasson. It was the first film I remember seeing about the war in Vietnam and was directed by Ted Post, based on a book by Daniel Ford .
Lancaster is an army major and sent to Vietnam with a small group of advisers. More and more, as time passes, he begins to see the mission as hopeless and in fact, resembling the fate of the French there ten years earlier. The locals are enigmatic and he can't control their actions. The Viet Kong are even more troublesome.
This is a quiet movie. Made just a few years after the war ended, it simmers with frustration and angst. I think it is one of the best movies about that war or any war because it points out its folly from the getgo. There were many fine movies made about the war in Vietnam but this is my favorite.