Hep topic. Lame poll. Seriousry, there are too many good movies missing and several crap ones that aren't even in the running for best.
I happen to have a short list, a few of which have been mentioned by others but alas most of which are conspicuously AWOL.
Voting is unthinkable before at least these are added. Heck, throw in The Good, the Bad, and the Ugly if a war settings is 'nuff (which apparently it is), and make it even more difficult to choose. Havent' seen Letters from Iwo Jima yet but it's highly rated.
9th Company, The (RUS: 9-ya rota)
Apocalypse Now
Beast, The (AKA: The Beast of War)
Big Red One, The
Boot, Das
Bridge, The (GER: Die Brucke, 1959)
Bridge at Remagen, The
Bridge on the River Kwai, The
Bridge Too Far, A
Brotherhood of War, The (KOR: Taegukgi hwinalrimyeo)
Cross of Iron
Dark Blue World (CZE: Tmavomodry svet)
Downfall (GER: Der Untergang)
Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb
Eagle Has Landed, The
Enemy at the Gates
Full Metal Jacket
Gallipoli
Great Raid, The
Henry V (1989)
Hill, The (1965)
Hunt for Red October, The
Johnny Got His Gun
Joyeux Noel
Kagemusha
Land and Freedom (1995)
Lawrence of Arabia
No Man's Land (BOS: Nicija zemlja, SLO: Nikogarsnja zemlja)
Paths of Glory
Patton
Platoon
Ran
Richard III (1995)
Sand Pebbles, The
Stalingrad (1993)
Tears of the Sun
Thin Red Line, The
To End All Wars
Waterloo (1970)
When Trumpets Fade
Young Lions, The
Zulu