CG = Helicopter Gunner - I think it's an 11-kill streak. You're a gunner on a helicopter that flies around the map for 30 sec
Big Team Battle: I think that refers to the "Ground War" game mode. It's a rotation between Domination (team hold and secure 3 flags to gain points) and Team Deathmatch but the player limit is set on 18 instead of 12. The game I play the most
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