The rules are simple, name the game, then make a new quote. Please make sure the game has an English release. I'll start. "Remember, no Russian." Have fun!
First one I can think of is MW2, though probably most COD games have that thrown in the spec-ops somewhere. "My cousin's out fighting dragons, and what do I get? Guard duty."
Halo? "Rise and shine, Mister Freeman, rise and … shine. Not that I wish … to imply that you have been sleeping on … the job. No one is more deserving of a rest, and all the effort in the world would have gone to waste until … well … let's just say your hour has come again. The right man in the wrong place can make all the difference … in the world. So, wake up, Mister Freeman. Wake up and … smell the ashes."