Master Chief Petty Officer John-117 is a fictional person. He is the main protagonist of the Halo video game series. He is also called Master Chief, or Spartan-117.
Master Chief is a player character in Halo: Combat Evolved, Halo 2, Halo 3, and Halo 4. He also is also featured in several novels and other games in the Halo series.
The character is never seen without his green-colored armor and helmet. He is one of the most recognizable characters from Halo. Several action figures of the character are available.
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