Infinity Ward has announced a one-time extension for Season One of Call of Duty: Modern Warfare, which will now end on February 11. The extension was driven by a host of upcoming activity, such as new items, challenges, remixed game modes, playlists, etc. For the remainder of Season One, there will be 2XP, 2X Weapon XP, and 2X Tier Progression to help you finish up your Officer Ranks and Tiers.