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Unlockable - Unlockable: Pentagon Map for Zombie Mode
Beat the game on any difficulty to unlock Zombie Mode, where you play as Nixon, Castro, Kennedy, McNamara, beat the game on any difficulty. Alternately, you can enter the 3ARC UNLOCK code in the cheats menu.
Code - Unlimited death machine
in "five" you can get unlimited Gatling gun by taking the icon for it and getting downed.
P.S. if you go in a corner lay down and have someone dive onto you then have another revive you two you get more nukes, max ammo ect.
these both work i used them.