I recommend Letters from Iwo Jima (2006)
I'm not a big fan of war films, at all. But this is probably one of the best movies I have ever seen. It's about the battle between the Americans and the Japanese for the mountain, Iwo Jima. Letters from Iwo Jima is from the Japanese point of view, theres another film from the Americans point of view that was released at the same time called Flags of Our Fathers. But the Japanese version is a lot better. However, if you watch one, you should definitely watch the other!