User blog comment:JoshCF1/The State of the Call of Duty series./@comment-1646923-20110206171106/@comment-28584497-20110206200904

That's because they had to get authorization by the copyright holders. Fact of the matter is that if they use that phrase exactly, not meaning it in a parody-style way (which would protect it under fair use), they can be sued for copyright infringement.