Most of the music for Call of Duty 4: Modern Warfare was written by British composer Stephen Barton, who had also contributed to film scores by Harry Gregson-Williams.
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The game's non-playable characters (NPCs) feature prominently in the story: Captain Price and his right-hand man, Gaz (voiced by Craig Fairbrass), serve as mentors to Soap.
While running the recruiting company, Mencher also contributed to the gaming industry as a producer of games such as Nikopol: Secrets of the Immortals and was given special thanks in the credits of: Force 21 and Call of Duty 4: Modern Warfare.
Paul Jackson, a playable character in the video game Call of Duty 4: Modern Warfare
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Video game theorist Tom Bissell, in his book Extra Lives (2010), notes the example of Call of Duty 4, where a player can all but kill their digital partner during gameplay without upsetting the built in narrative of the game.
In the games Call of Duty 4: Modern Warfare, Call of Duty: World at War, and Call of Duty: Black Ops for the Xbox 360 and more recently the PlayStation 3, players could copy their game save data to their computer and modify it so they could use noclip in online multiplayer matches.