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XBox - GunGriffon: Allied Strike cheats

Stage 2 hint:
While playing on stage 2, when the helicopter support comes in for rapairs and 
an ammo refill, go to the drop site and try to protect the helicopter. Once the 
helicopter shooted down, no more helicopters will come. Try to move always to 
avoid hits and never stop or the mammoth class will shoot missiles to you. 
They cannot get a lock on you if you are in move.