ShellShock: Nam '67 Cheats for Playstation 2

Enter the following at the title screen:

Code:	Result:
Up, Down, Left, Right, Circle, Square, Up, Down, Left, Right, Circle, Square	"add weapon" option added to the pause menu
Up, R2, Circle, Left, Triangle, Square, L2, L1, Circle, R1	acid trip mode
R3, L3, Right, Left, L1, R1, R3, L3, Right, Left, L1, R1	god mode
R2, R1, Triangle, L2, L1, Up, R2, R1, Triangle, L2, L1, Up	inf. ammo
L2, R2, L1, R1, L1, L2, L2, R2, L1, R1, R1, R2	unlocks all missions and pictures

Enter Cowboy as a name. Your character will wear a cowboy hat in some intermission sequences.