Default Classes for Modern Warfare 3 are the first default weapon classes available to you in multiplayer play, however after you level up your Multiplayer Career, you will unlock the ability to create Custom Classes. GRENADIER G36C Grenade Launcher and Red Dot Sight PP90M1 Frag Concussion Grenade Scavenger Overkill Steady Aim UAV Precision Airstrike Unidentified  [ Read More ]