War

Napoleonic Wars:
The Duellists

Master and Commander: The Far Side of the World

WWI:
Paths of Glory

WWII:
Saving Private Ryan 12 year olds' favorite movie.

Inglourious Basterds 14 year olds' favorite movie.

Patton 24 year olds' favorite movie.

Schindler's List Will make you cry if you're a Jew.

Das Boot Greatest naval movie of all time.

Letters From Iwo Jima Good movie from the opposite side of the battlefield. Much better than Fags of our Fathers.

The Thin Red Line

Black Book

The Great Escape

Vietnam:
Apocalypse Now The Horror...

The Deer Hunter

Full Metal Jacket The first half is better than the second, now STFU.

Good Morning, Vietnam

Platoon

Gulf War:
Jarhead

Three Kings

Iraq War:
Body of Lies

Green Zone

The Hurt Locker

The Kingdom

Other:
Lebanon (1982 Lebanon War)

No Man's Land (Bosnian War)