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Nintendo Wii - Call of Duty 3 cheats

Unlock all chapters and bonuses:
Go to the chapter selection screen and hold Plus and press 
Right, Right, Left, Left, 2, 2.

Unlock bonus interviews:
Finish the game to once to view interviews with veterans Gordon Boulton, 
Sgt. Stan Markut and Sgt. John D. "Bud" Hawk.

Hold Extra Grenades
You can hold 6 grenades by default, but when you have a grenade thrown at you 
you can pick it up and throw it again. Instead of throwing the grenade you can 
keep it for later by pressing the minus button a second time after picking up 
a grenade.