Awards and Medals
Purple Heart: Get wounded or killed in action.
Bronze Star: Get 15 kills.
Silver Star: Get 20 kills.
Distinguished Service Cross: Get 25 kills.
Congressional Medal Of Honor: Get 30 kills.
Unlock all the maps in quick mission mode
At the title screen, press: R1, L1, L1, R1, R1, R1.
All guns
At the main menu, press X, Left, Triangle, Square, X, Select.
All missions
At the title screen, press X, L2, Triangle, R2, Select.
Invincibility
Pause the game, then press L1, R2, L2, R1, Select.
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