To the people outside USA, most of the documentary about USA involvment in wars are totally biased, the same with Hollywood movies. Of course there are wonderful exceptions like "When trumpets fade", "The thin red line" and "Flag of our fathers" but the mainstream of Hollywood movies are only funny; and of course forget the History Channel. The european war movies has more credibility, of course they have terrible examples too but most of them are fine. In about this vietnamese documentary, who knows, I have to view it first.