What are the most realistic movies about the Vietnam War?

I know, its "just a movie" and can never do justice to the real war. But are there any movies (NOT 'Platoon', 'Hamburger Hill', or 'Full Metal Jacket') that portray the fighting in the war realistically? There was one movie from the 1980s (I think) with Lee Emory (the sergeant from Full Metal Jacket) who fights off the NVA at a Firebase. If anyone knows the title, I'd be much obliged. Was it 'Firebase Gloria'? If so, how do I get my hands on it? That was a great movie...