John-117 - Character - Halopedia, the Halo wiki
Master Chief Petty Officer John-117, also known simply by his rank as the "Master Chief" or (as is common in military culture) simply as the "Chief", is a Spartan-II supersoldier of the UNSC Navy's Special Weapons division.
John-117 - Character (Silver Timeline) - Halopedia, the Halo wiki
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.
John-117/Relationships - Halopedia, the Halo wiki
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.
John-117/Late War - Halopedia, the Halo wiki
John-117: "Which means?" Cortana: "Which means that the light has become coherent. Solid. How did you know what control to push?" John-117: "I didn’t. Let’s get the hell out of here." — John and Cortana react to the Spartan's intuitive ability to use technology on the ringworld.
John-117/Early life - Conflict - Halopedia, the Halo wiki
As the leader of the Spartan-IIs, John was one of five to embark on their first true deployment against the Insurrection; he and his team infiltrated the secret United Rebel Front base Eridanus Secundus and captured Colonel Robert Watts.
John-117/Human-Covenant War - Conflict - Halopedia
John-117: "All due respect, ma'am, they fought for us and we should have fought for them." Yao: "That will be enough, soldier." — John makes his dissatisfaction with abandoning allies to the Covenant clear to Lieutenant Commander Yao.
John-117/Quotes - Halopedia, the Halo wiki
- To the Weapon, who told him that Spartan Killers are after the pilot. "Because they'll need to go through me first." - To the Weapon, asking him why he's sure the pilot is safe.
John-117/Post-War - Halopedia, the Halo wiki
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 John-117 - Character - Halopedia, the Halo wiki
vehicle use , grenades, melee (detach turrets, assassinations), spartan abilities (sprint, clamber, slide) Tag name(s) (?): spartan_masterchief
SPARTAN-II program - Halopedia, the Halo wiki
At least John-117, who was elevated to a legendary status as the "Master Chief" in the final months of the war, was given an elaborate, inspiring origin story to hide his true background, promoted by several individuals claiming to have known or interacted with John at some point.