There is a hidden killstreak on MW3 as far as i understand you only get the killstreak called "M.O.A.B" or you can call it "Mother Of All Bombs" Its like a nuke but it doesn't end the game just kills the other team and disables u.a.v and etc. You need to get 25 kill streak with you gun i think but hey if you Dont believe me try it in a private lobby.