Army Men: Sarge's Heroes 2 cheats, and Codes for PSX.
Pause during a game and press Square, Circle, L1, R1.
All weapons with full ammunition
Pause during a game and press Square, Circle, R1, L1. Enter the code again to refill ammunition.
Enter the following passwords at the cheats screen to unlock the corresponding levels:
Tin foil uniform
Enter TNMN as a password. This is not armor, but there are similarities.