If you are asking for a key for the pc game you will have to buy the game from a local store or from a online retailer.
The Xbox 360 should not require one for normal play. If you want to unlock bonus martial check and see if you have a code somewhere in your cd box.
Also please do not post the game question twice. It does take us a few minutes for someone to see your question.
Enjoy the game :)
Kyle
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