Training

If you do not know this already if you are new to the Call of Duty series you may have a hard time figuring out how to know the best classes and strategies. If this is your case you could look up classes and strategies, then test them out with your friends or if you're playing Call of Duty: Black Ops you could try out the Combat Training mode. And if this doesn't help I will share one of my favorite MW3 classes. First you must be a level 40 or have unlocked the ACR if have then put kick and a silencer on it. Then have a throwing knife and a concussion grenade. Once you have this I would recommend having either Blind eye or Sleight of Hand, then put Assassin or Hardline on, then Marksmen. Then have the death streak Dead mans hand or something like it. Then have the strike package assault with a Care Package, a Predator Missile, and a Attack Helicopter.