 It is the eighth installment of the "Call of Duty" series and the third installment of the "Modern Warfare" arc.Due to a legal dispute between the game's publisher Activision and the former co-executives of Infinity Ward – which caused several lay-offs and departures within the company – Sledgehammer Games assisted in the development of the game, while Raven Software was brought in to make cosmetic changes to the menus of the game.The game was said to have been in development since only two weeks after the release of "Call of Duty