(in some versions press the " ` " key,
type in the code and press ENTER.)

them in the " ` " console:
If the game is running continuously, you can
use the up and down arrow keys instead of
typing them in again and again.

iwillsurvive - God mode
raindropskeepfallinonmyhead - Allow call for arty < 5 Shots >
can be re-entered for more
takeittothelimit - Ammo reload
hitmewithyourbestshot - Computer rocks
closetoyou - Surprise/ Invisible to the enemy
sky - brighter display
Level select - letmego

Press "T" to bring up a command window
--------------------------------------
AMMO - you got what I need
REFUEL - big gulp
HEAL - chiliburger