Successfully completed the game on the Hardened difficulty setting to unlock Survival mode.
Infinite health
Successfully complete the game on the Hardened difficulty setting to unlock the option for unlimited health for the Tour Of Duty that was played. Alternately, successfully complete the game with all Gold medals.
Infinite ammunition
Successfully complete the game on the Green difficulty setting to unlock the option for unlimited ammo for the Tour Of Duty that was played. Alternately, successfully complete the game with all Bronze medals.
Infinite grenades
Successfully complete the game on the Veteran difficulty setting to unlock the option for unlimited grenades for the Tour Of Duty that was played. Alternately, successfully complete the game with all Silver medals.