From the preview: "For Warfighter, a big emphasis was put on Fire Teams. Think of the way your friends' outline show up in Left 4 Dead no matter where they are. This happens in Warfighter albeit it will only show up for one other person, but that's not all. When talking to the two dozen real life operatives from around the world, the development team got this dynamic from them and integrated it in their way into the game. The Navy Seals call them your swim buddy, but it's basically your partner and because you work so closely with that person, you tend to know what he's going to do and what he can offer as support."