How did John-117 get the title of Master Chief?

MCPON John-117, or "Master Chief", is a fictional character and the protagonist of the Halo fictional universe created by Bungie. Master Chief is a playable character in the series of science fiction first-person shooter video games Halo: Combat Evolved, Halo 2, Halo 3, Halo 4, and Halo 5: Guardians. read more

Master Chief Petty Officer John-117, better known to the public as the Master Chief, is a Spartan-II supersoldier of the UNSC Navy's Special Weapons division. He served as one of the most important figures of the Human-Covenant War. read more