Before entering one of the following codes, put the game in pause mode. Then, hold down L1 + R1 then press O, O, Left, Triangle, O, X. When seeing the words "Enter Cheat", press:

L2, L1, Square, L2, L1, R1 - Infinite ammunition
L1, R2, R1, Up, Triangle, Circle - Full adrenaline
X, Triangle, O, Right, Triangle, O - Single Player Suicide
L2, R1, L2, L1, Triangle, Triangle - Disable Shellshock
Up, X, R2, R1, Up, Square - Pickup OSS Document
Down, L2, L1, Up, Square - Kill Nemesis
O, Down, O, Up, Triangle, O - Hide HUD