Field upgrades are a welcome addition to the Modern Warfare arsenal and add another layer of complexity to the game. Here's a full list.
Field upgrades are a new addition to Call of Duty: Modern Warfare, and they had another layer of complexity to your multiplayer matches. Field upgrades are rechargeable powers that can be used to aid you or your teammates. They usually are less potent than your average killstreaks,, but they recharge whether you are killing things or not.
Full story from the WindowsCentral blog...