Not in any order,
Hunt for Red October
FMJ
Paths of Glory
Patton
Platoon
Dirty Dozen
Shindlers List
Paths of Glory
Das Boot
Run Silent, Run Deep ( dont know if it belongs on the list, but this movie intrigued me since I was a little kid. I need to watch it again)
We Were Soldiers
Technically, unless one uses the phrase "cold war", The Hunt for Red October was not really a war movie as it didn't portray a time when countries were actually in combat.
But, just for grins, I'll throw in Gettysburg and The Rough Riders, although there are others. In Harms Way, Battleground, and Battle of the Bulge come to mind. I'm sure I'll think of others later.