America's Army is a multiplayer first-person shooter computer game series. It can be played using Windows, Macintosh, or Linux. It is the official game of the United States Army. The first version was free. It came out on July 4, 2002. It has been updated many times since then. The second important release was "America's Army: Special Forces" in November 2003. "America's Army" was made by the "MOVES Institute" at the Naval Postgraduate School. It is based on the Unreal engine.