Enter one of the following codes at the cheat codes menu to activate the corresponding cheat function:

Cheat Code - Effect

APANPAPANSNALE9 - All chapters
HA2P1PY9TUR5TLE - U.S. Army version
MERCENARIES - Unlimited ammunition
NickWest - Big head mode
SWEDISHARMY - Authentic mode
ROCKETARENA - Unlimited M203 and hand grenades