Abomination

Press the ENTER key then enter one of the following cheats:

autowin! - Win Instantly
dolemite - Soldiers are invincible
paul haney sees all - Show enemy soldiers
toggle bottombar - Switch bottom display
set_campaign - Select Campaign (See Below)

Add one of these to the set_campaign cheat above
Angola_tutorial
Angola
Romania
Kola
Caribbean
Kola_2
Ecuador
Peru
Angola_2

Bug Exploitation:
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Go to Multiplayer and host a newgame. It can be any connection. When you get to change the game settings, one of the menus let's you set unlimited ammo. Start the multiplayer game and then quit it. Load an old game or start a new one and you should have unlimited ammo, as well as unlimited grenades. You only have to do this once each time you start the game.