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It unlocks everything in MP; however, it can only be used on servers that allow it, which, I think, non do.

You find this answer alot when searching the internet... but it is wrong. The Modwarfare makes all players joining the server start at rank one. So it really is the opposite of what is often told: Instead of being able to use all weapons and perks you start at rank one, no matter how high your rank in the vanilla version is.

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