Call of Duty is a 2003 first-person shooter video game developed by Infinity Ward and published by Activision. It is the first of many installments in the Call of Duty franchise.[2] The game simulates infantry and combined arms warfare of World War II using a modified version of the id Tech 3 engine built for Quake III: Team Arena. Much of its theme and gameplay is similar to the Medal of Honor series; however, Call of Duty showcases multiple viewpoints staged in the British, American, and Soviet theaters of World War II.