User blog comment:Admiral Leviathan/Hey! I was still Making Payments! (FTGF11)/@comment-2217776-20101222200711/@comment-1870507-20101226051932

You do release that not all Call of Duty games are M-rated. Call of Duty 4, World at War, Modern Warfare 2, and Black Ops are the only ones M-rated. Then again, that makes Call of Duty 1-3 the only ones that are not M-rated.