The Call of Duty series has been a bit of a hit for Activision. It started as an entry in the WWII PC first-person shooter sweepstakes of the early 2000's with the original Call of Duty, released in 2003. This was followed by a, well, army of sequels and spin-offs for every gaming device of any note, eventually shaking off its historical warfare roots and moving into modern times. The most recent iteration of the series is Call of Duty: Black Ops II, released in late 2012, netting Acti...