At the main menu, press X, Left, Triangle, Square, X, Select.
All missions
At the title screen, press X, L2, Triangle, R2, Select.
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.
Invincibility
Pause the game, then press L1, R2, L2, R1, Select.
Unlock all the maps in quick mission mode
At the title screen, press: R1, L1, L1, R1, R1, R1.
Various Cheats
At the title screen, quickly enter one of the button combinations indicated below for the corresponding effect.
All guns...