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Cheat Code Central
http://www.cheatcc.com/pc/codenameob.html
Includes codes for the game.
Game Revolution
http://www.game-revolution.com/games/codes/pc/codename_outbreak.htm
Contains cheat codes for the game.
The Adrenaline Vault
http://www.avault.com/cheats/getcheat.asp?game=codeoutbreak
Explains how to add health.