Black Hawk Down.
The part when the two delta force snipers go 2 vs ~200 (might be quite inaccurate but the point is there were too many hostiles) to save the life of a downed helo pilot. Both of the snipers get killed, but the pilot survives.
And that just ain't someones imagination, that actually happened. And those two snipers (Shughart and Gordon, yes I do remember their names) both got a Medal of Honor for that, and were the 1st snipers in history to get it, and as far as I know they still are the only ones. Just typing this makes me cry. Seriously, that kind of bravery is very rare.