'War' is far too wide a genre to only pick 10.
But in terms of films that literally show war-
1. Apocalypse Now
2. Ran
3. Saving Private Ryan
4. The Deer Hunter
5. Lawrence of Arabia
6. Atonement
7. Das Boot
8. Intolerance
9. Paths of Glory
10. All Quiet on the Western Front
Lots of incredible films within broader genre of war:
Grave of the Fireflies
Schindler's List
The Best Years of Our Lives
etc.
1- Kelly's Heroes
2- The Big Red One
3- Full Metal Jacket
4- Midway
5- The Hunt for Red October
6- The Dirty Dozen
7- The Great Escape
8- Red Dawn
9- Heartbreak Ridge
10-Hamburger Hill
I'd include The Good, The Bad & The Ugly, Dances with Wolves, Duck, you Sucker & Good Morning Vietnam if they had more parts of the wars shown that they took place during.
Ok I'm gonna stretch definitions: Band of Brothers.
Best ever.
My top 3 ones are
Inglourious Basterds
Full Metal Jacket
9th Company (9 rota)
In a very particular order, from top rated down:
1. Apocalypse Now
2. Black Hawk Down
3. The Longest Day
4. A Bridge Too Far
5. Gettysburg
6. Glory
7. Platoon
8. Paths of Glory
9. Northwest Passage
10. The Siege of Firebase Gloria
I've lived upon the edge of chance for 20 years or more...
Del Rio's Song
1 Platoon
2 Schindler's List
3 The Deer Hunter
4 Saving Private Ryan
5 Full Metal Jacket
6 Apocalypse Now
7 Hacksaw Ridge
8 Born On the Fourth of July
9 American Sniper
10 Inglorious Bastards
In no particular order:
Saving Private Ryan
Full Metal Jacket
Platoon
Apocalypse Now
The Longest Day
Dr. Strangelove
Lawrence of Arabia
The Bridge on the River Kwai
The Deer Hunter
The Hurt Locker
Schrodinger's cat walks into a bar and doesn't.
Spartacus
Tora Tora Tora
Midway
Stalag 17
The Dirty Dozen
The Bridge Over the River Kwai
The Caine Mutiny
Patton
The Great Escape
Saving Private Ryan