Call of Duty is a first-person shooter video game developed by Infinity Ward and published by Activision in 2003. It is the first game in a series with the same name. The game simulates the infantry and combined arms warfare of World War II. The game is based on the Quake III: Team Arena engine. It was accompanied in September 2004 by an expansion pack, Call of Duty: United Offensive, which was produced by Activision, and developed by Gray Matter Interactive, with contributions from Pi Studios. Call of Duty is similar in theme and gameplay to Medal of Honor, as it is made out of single-player... campaigns and missions. However, unlike Medal of Honor, the war is seen not just from the viewpoint of an American soldier but also from the viewpoint of British and Soviet soldiers. The game was somewhat unusual at the time in that throughout the single-player mode the player is joined by computer-controlled allies who range in quantity from two infantrymen to an entire regiment of tanks . The computer-controlled allies will support the actual player during the missions.
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