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Found a list of how to unlock every tittle, call sign and emblem out.

http://callofduty.wikia.com/wiki/Callsigns

The list is pretty damn detailed and should help you get anything you want.

Thanks for this, I got Cod MW2 for my birthday, and I was wondering how to unlock most of these. Cheers

Yeah, some of the stuff is ridiculous!

I've seen this before, very useful resource, thanks for the share.