I posted my list earleir and thought about it and realized I disagreed with my own list. I deleted it and decided to repost my official list. Hey, its 2am and i'm bored...
The best War/battle film ever is the anime Grave of the Fireflies. It may also be one ofthe most depressing movies ever.
My other 9 in no particular order:
Full Metal Jacket
Kingdom of Heaven (Directors Cut. It's sooo much better than the theatrical cut)
The Deer Hunter
The Last Samurai
Honorable mentions to Tears of the Sun, We Were Soldiers, Good Morning Vietnam, and Apocalypse Now.