User blog comment:Griever0311/Ask A Marine Part Deux/@comment-1848120-20100317184725

When you shoot with open sights, do you have both eyes open?

I used to shoot (as a kid) with my left eye closed, but when qualifying for M16A2 (yes, i got marksman) they said to shoot with both eyes open.

Do they also make you qualify on the rifle with a gas mask? They make us, we have the big MCU 2/P masks, i think the marines use the two-eyed masks. Very hard to press a cheek up to the stock.