1 = Call of Duty (2003)
2 = Call of Duty: United Offensive (2004)
3 = Call of Duty II (2005)
4 = Call of Duty III (2006)
5 = Call of Duty IV: Modern Warfare (2007)
6 = Call of Duty: World at War (2008
7 = Call of Duty: Modern Warfare II (2009)
8 = Call of Duty: Black Ops (2010)
9 = Call of Duty...