Infinity Ward does a game release every two years and Treyarch does them the other years so they can have annual releases. Activision owns both development companies and markets the games
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there is seven call of duty series
It's not available for the Modern warfare series of call of duty
The company that sponsors the "Call Of Duty" series, is "Activision"
The first Call of Duty video game was relased October 29, 2003. The first Halo video game was released on November 15, 2001. Halo came first.