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I know that it was posted before !! But i just want to say that your classname will be invisible if you put AM or AJ in it.
Or you could go on on elite on your pc/laptop/mac or whatever you have, go to your mw3 custom classes, and rename them, and if you put too many characters the name doesn't show up at all. That's how I did it on ps3, not sure about xbox though.