Battlefield 2 is a first-person shooter video game, developed by Digital Illusions CE, with contributions by Trauma Studios. Battlefield 2 was published by Electronic Arts and is the third full game in the Battlefield series, released on June 21, 2005 in North America for Microsoft Windows. The latest version is v1.50, which was released on September 1, 2009 and added the content of the Euro Force and Armored Fury booster packs, as well as the Highway Tampa and Operation Blue Pearl maps. Players fight in a modern battlefield, using modern weapon systems. Battlefield 2 is a first-person shooter with some strategy and role-playing game elements. The single-player features missions that involve clashes between U.S. Marines, China and the fictional Middle Eastern Coalition. The multiplayer aspect of the game allows players to organize into squads that come under the leadership of a single commander to promote teamwork. The story takes place in the early 21st century during a fictional world war between various power blocs: China, the European Union, the fictional Middle Eastern Coalition, Russia and the United States. The game takes place in different fronts, as the Middle East and China are being invaded by US and EU forces, and the United States is being invaded by Chinese and MEC forces. A sequel, Battlefield 3, was released in October 2011.