During gameplay press to bring up the console then enter a code below:
GIFTFROMPTERODON - Cheats Enabled Turn this on first
CHTHEAL - Max out Health
CHTHEALTEAM - Max health for team
CHTWEAP - Get Weapon 0-30
CHTAMMO - Max out Ammo
CHTGRENADES - Get Grenades
CHTALLQF - Quickfights enabled
CHT3PV 0/1 - Different View
SHOWFPS 0/1 - Framerate
SHOWPROF 0/1 - Stats on/off
CHTCANNIBALS - ????????
CHTKOSTEJ - ????????
How To Fly
To fly if you are on the Viet Cong team you have to crawl up to the top of helicopter and crawl off to the right. You should then fall through the ground instantly. You will have to press CTRL as soon as you fall through the ground or else you'll keep falling and it will take for ever to get back up. Once you've stopped falling press SPACE BAR. You should keep going up and through the ground,then you have to press CTRL again to stop going up and voila your flying.
The controls of flying are hard to master. So it will be awhile for you to master them.
To go up press SPACE BAR, but be careful once you go up you can't stop. To stop press CTRL,but once you've pressed CTLR you keep going down to you hit the ground. The way i do it is hold CTRL until i get to the place i want to go then let go.
P.S. This cheat won't work if you've set the controls different from default the way the controls were when you got the game.