Though the game is still built on EA DICE's Frostbite 2 engine, Danger Close Games handled all development of Warfighter, including the new Fireteam multiplayer mode in which two players join forces to share health and ammo during battle. Gamers can select special Tier 1 soldiers from ten different countries, including Germany, South Korea, Russia, and three different branches of the U.S. military, and then choose from the Assault, Sniper, Demolitions, Point Man, Heavy Gunner, and Spec Ops character classes. As many as 20 players can compete across eight different maps in a variety of modes, including Combat Mission, Team Deathmatch, and Sector Control.