During Gameplay press the BACKSPACE key and type !throw me a frickin bone here then put in one of the following codes

Fail Mission !the meek
Selected Units Die !time for bed
Get Faster Soldiers !pump me up
Go to Debug Mode !rate me
Finish Mission !cut to the chase
Turn Off Computer AI !oh behave
Turn On Computer AI !mojo
Random item/effect !mona lisa
Remove disguises !let me down
Unit Gets three bombing airstrikes !heavenly glory
Unit Gets three napalm airstrikes !this one goes to eleven
Unit Gets three recons !peep show
Unit Gets nine blue disguises !i woke up this morning
Unit Gets nine gray disguises !incognito
Unit Gets flak jacket !whistle and flute
Unit Gets infinite sniper rifle ammo !yippee!!!
Unit Gets infinite air attack !roody-pooh
Unit Gets infinite plastic mending kit !florence
??????? !when all else fails...
??????? !full monty
??????? !game over
??????? !mib
??????? !scotty
??????? !hey stifler
??????? !one time...
??????? !spiny norman
??????? !stay frosty
??????? !henry
??????? !harsh language
??????? !here's a lockpick...
??????? !vic fontaine
??????? !halloween
??????? !johnny rico
??????? !penny