This is a hidden streak reward, obtained only by accumulating 25 unassisted kills with your weapon (meaning Pointstreak kills don’t count). This is a massive bomb that kills every enemy on the map, eliminates all enemy equipment, and activates an EMP for one minute. Unlike the Tactical Nuke from MW2, the round will not automatically end once the MOAB is used. Any strike package can earn the MOAB.
This Video Shows MOAB in action.