In-Game Cheats:
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To unlock the following, you must beat the respective tour of duty
(US, Canada and Britan).
Result Code
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Unlimited Ammo – Beat the game on the Green Difficulty
Unlimited Grenades – Beat the game on the Veteran Diffculty
Unlimited Health – Beat the game on the Hardened Difficulty
Survival! Mode:
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Play and beat the game on Hardened Mode, then it will ask if you want
to switch to survival mode. Select yes and it will switch to Survival Mode.