Press ~ during game play to display the console window, then type giftfrompterodon to enable cheat mode. Then, activate the following cheats by entering the corresponding codes. Note: Most of the codes can only be used in single-player mode.
CHEAT FUNCTION - CHEAT CODE Restore health - chtheal Restore health for team - chthealteam Weapon select - chtweap <0-30> Refill ammunition - chtammo Get grenades - chtgrenades Enemies cannot hurt you - chtkostej Access all quick fight maps - chtallqf VC and NVA wear Indian masks - chtcannibals Toggle third person view - cht3pv <0 or 1> Toggle frame rate display - showfps <0 or 1> Toggle stat display - showprof <0 or 1> Mission select - s_all_tasks Mission skip - s_pass Unlimited ammunition - s_full_ammo_on Disable unlimited ammunition - s_full_ammo_off Invincibility - s_undead_on Disable invincibility - s_undead_off Exit game - exit
After the first level, when you go back to your bunker go to the shooting range. Go to the supply room. There will be a bottle under the table .Shoot it and music will start. Leave the room and there will be a man standing there, beating invisible drums. He will not die, no matter what you do to him.
Note: The man playing drums is not really invincible. After thirteen grenades from the M79 launcher, he stops playing the drums and falls on the ground. After another thirteen grenades, he dies and just lies on the floor.