Greetings, Devil Dog! Welcome to the Call of Duty Forums. It looks like you're looking forward to Call of Duty: Modern Warfare, but haven't created an account yet. Why not take a minute to register for your own free account now? As a member you get free access to all of our forums and posts plus the ability to post your own messages, communicate directly with other members and much more.
Hmm that's interesting. I looked it up and the answer was pretty much Because. That isn't much of an answer really. Another site answered saying that they think it's to avoid confusion with another product that used even numbers. Yeah. Okay.