I've watched quite a few. Apocalypse Now and Full Metal Jacket are great films. IMO, Platoon is the best movie about the Vietnam War that has ever been made. I wasn't in Vietnam, but I know a lot of vets and most who have an opinion on the matter and have seen it, agree.

I remember going and seeing it when I was in ROTC and a bunch of other cadets just happened to be there. Later, I was talking to my favorite instructor about it. He was a salty old SFC who had been with the 1st CAV over there and he told me he thought it was the best, most realistic film that mirrored his own experience greatly. Me mentioned Apocalypse Now and said it might have been a realistic film about the Green Beret experience, but he had no knowledge of that and it didn't true up with what he'd seen and done over there.

Lots of good films about Vietnam.