Solve : Mod Warfare COD 4?

1.	Solve : Mod Warfare COD 4?
Answer» On multiplayer Mode I have reached the COMMANDER rank, So I went to Mod WARFARE mode and played a few games, but It will not LET me unlock the rank and challenges. ALSO It started me out with the Private rank But I do not advance? IM Confused! And *&^%$ MAD! Can anyone help? Thanks.

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