I haven't seen American Sniper yet, but I will when it comes out on DVD. But here are a few of my all time favorites.

Band of Brothers
We Were Soldiers
Braveheart
A Bridge Too Far
Saving Private Ryan
Full Metal Jacket
Patton
Twelve O'Clock High
Sergeant York
Das Boot
Master and Commander, Far Side of the World
Bridge over River Kwai
The Bridges at Toko Ri
Midway

Just some of my favorites off the top of my head...what good one's did I miss?