DESC: The critically acclaimed Call of Duty franchise moves to the 21st century in Call of Duty 4: Modern Warfare. Tackle a variety of missions as a US Marine or British SAS Agent to thwart a terrorist madman bent on launching a nuclear assault against the western world. Call of Duty 4: Modern Warfare has a thrill-ride single player campaign, but it's the robust multiplayer mode that will keep players coming back for more. Featuring a deep leveling system and a variety of different modes of play, Call of Duty 4 is the most popular multiyplayer console game ever released.