Call of Duty is a first-person shooter video game franchise. The series began on Microsoft Windows, and later expanded to consoles and handhelds. The earlier games in the series are set primarily in World War II, including Call of Duty, Call of Duty 2, and Call of Duty 3. As of April 2015, the Call of Duty series has sold over 175 million copies. Sales of all Call of Duty games topped US$10 billion. They have over 2 million subscribers and over 619 million video views on their YouTube channel.
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