Master Chief Petty Officer John-117, also known simply by his rank as the "Master Chief" or simply as the "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...

The childhood and early adolesence of John-117 were marked by formative years which saw the young boy mature far beyond his age as he was stolen away from his home and family and forced through a grueling regimen of training and indoctrination in...

Master Chief John-117 Gameplay role Faction: Player Unit type: Hero Character stats Weapons: any

John-117: "Like hell she is." — John rebuffs Spartan Locke's claim to the investigation of Cortana immediately before striking him. At 0630 hours, shortly after departing the Argent Moon, John and the rest of the Spartans of Blue Team were declared absent without leave.

Master Chief Petty Officer John-117 is a Spartan-II supersoldier in the United Nations Space Command. He served as the leader of Silver Team under the Asymmetric Warfare Research Group.

This article details John-117's actions during the Human-Covenant War, up until the end of 2544.

This article details John-117's actions in the final year of the Human-Covenant War.

In a strange twist of fate, John-117 built a close friendship with the AI Cortana, a construct "born" from the mind of Dr. Halsey herself. Despite some initial hesitation towards working with an AI out of fear of conflicting directives, John and Cortana quickly formed a formidable team.

"Who are you?" - John-117 to the Librarian." The Prometheans... they're human." "Planning for what?" "Can I defeat the Didact without it?" "It's a long story, but I know what the Didact's after." "Sierra One One Seven to Infinity, what's our status?" "Does Infinity have a shot on the gravity well?" "Sir, we've seen what the Didact is capable of ...

Master Chief Petty Officer, abbreviated to MCPO, also nicknamed as "Top Chief" out of respect for John-117, is the highest enlisted rank in the United Nations Space Command Naval Command (NAVCOM) rank structure; including the UNSC Navy and Office of Naval Intelligence.