Army Men: Sarge's Heroes

Level select
At the main menu, hold Square + L1 + R1 and press Up, Down, Left, Right. If you entered the code correctly, you will hear a sound.

All weapons with infinite ammunition
Pause the game and press Square, Circle, R1, L1. If you entered the code correctly, you will hear a sound. -From: mbrodeurrules@hotmail.com

Game Shark Codes

Infinite Health (GS 2.2 or Higher Needed) -- E006DBA8 0028 30107814 00FF
Infinite Health (Partner) (GS 2.2 or Higher Needed) -- E006D3AC 0028 3010CEB4 00FF
Infinite Ammo -- D0074DF8 0002 80074DFA 2400 D0077330 0002 80077332 2400
Infinite Timer (Boot Camp) -- D00DF6B8 0373 800DF6B8 0367
Unlock All Missions (GS 2.2 or Higher Needed)
E00F85B0 0000
300F85B0 0002
E00F85B4 0000
300F85B4 0005