Restrepo is a great documentary. Very good.
Band of Brothers
Saving Private Ryan
Bridge Over the river Quai--Remember watching this one when I was fairly young on a Sunday afternoon.
The Great Escape
A Bridge too Far
Titanic
Full Metal Jacket
The Patriot
Sure, I'll even go with Braveheart, although not really a war movie
Only had time to get through part of Tora Tora Tora!, but what I saw was good.
The Longest Day--Possibly the first WWII movie I ever watched. I sat all the way through it the first time and then watched most of it again!
Andersonville--Proving Americans can be just as cruel to each other as the Germans can be to each other.
Gettysburg
Gods and Generals
Flags of our Fathers was a really good book, but I can't comment on the movie.
And, if you feel like getting pissed off at people who hate America:
Fall From Grace. I came out of my chair and wanted to kick some A$$ but couldn't as it was only a movie screen.