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Call of Duty is a first person and third-person shooter video game series franchise. The series began on the PC, and later expanded to consoles and handhelds, and several spin-off games have also been released alongside the main series. The majority of the games in the series have been set primarily in World War II, with the exception of Call of Duty 4: Modern Warfare and Call of Duty: Modern Warfare 2, which are set in modern times.
As of November 27, 2009, total sales for the Call Of Duty series have surpassed 55 million units worldwide, taking $3 billion in retail sales in the process.
You can find out more at Call of Duty Wiki.
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