Enter the following as Passwords:

LEVEL 1 : JUNGLEWAR
LEVEL 2 : BUCCANEER
LEVEL 3 : DETONATE
LEVEL 4 : AFTERSHOCK
LEVEL 5 : BLITZKRIEG

LEVEL 6 : CHESSPIECE
LEVEL 7 : BASTILLE

Bonus	: LIGHTNING

Super cheat:

Enter CHEESYPOOF as a Password for unlimited ammo, unlimited fuel and invincible

armor.

Other Passwords:
Type these codes in the "Load/SaveEnter password" menu. 
OLDSCHOOL    old view 
AFTERSHOCK   nuclear detonation
UNLEADED     unlimited fuel 
GUNSRUS      unlimited ammo
CHAINMAIL    unlimited armor
EAGLEEYE     Recon Mode (You can't shoot, neither can the enemy)
SHARK BAIT   Shockwave (Shoot a missile or rocket into the ground, you'll see)    
MAD BOMBER   Shockwave, Unlimited Ammo
Note: For codes with a space in them,use the right arrow key.

Thanks to Revolution readers Ryan, Jordan, Bronx, Tom Evans, Tyronne Rehan Shrikanthan

and Matt465!