Greetings, Devil Dog! Welcome to the Call of Duty Forums. It looks like you're looking forward to Call of Duty: Modern Warfare III, 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.
I recently changed my Xbox gamertag and then also my Activision name to match. The new name shows up in game (lobbies and during a match), but my old one still shows up when I go to Barracks -> Records to compare stats with friends
I figured all the systems just needed time to update/refresh...