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Xbox 360 - Ghost Recon Advanced Warfighter cheats

Scott Mitchell invincible:
Press Start while playing the game, after hold LT + RT + Back and press 
Y, Y, X, RB, X, LB.

Team invincible:
Press Start while playing the game, after hold LT + RT + Back and press 
X, X, Y, RB, Y, LB.

Unlimited ammunition:
Press Start while playing the game, after hold LT + RT + Back and press 
RB, RB, LB, X, LB, Y.

100% health:
Press Start while playing the game, after hold LT + RT + Back and press 
LB, LB, RB, X, RB, Y.

Level select 
Go to the mission selection screen. 
Hold down LT + RT + Back after press Y, RB, Y, RB, X to unlock all missions. 

You will hear a sound, if typed the codes correctly.

Unlocking Falcon weapon 
Shot down 100 helicopters in Multiplayer mode

Unlock Sniper Rifle 
Get more tham 500 head shots in Multiplayer mode

Unlock Warfighter mode 
Finish the game on any difficulty adjustment