Master Chief

マスターチーフ

John-117, the Master Chief Petty Officer of the UNSC Navy, is a SPARTAN-II Commando serving under the UNSC Naval Special Warfare Command.
John was removed from his homeworld, Eridanus II, and trained to become a Spartan starting at the age of six. He and 32 other recruits completed the SPARTAN-II program. During this process, he underwent mechanical and biological augmentation.
His augmentations include:
1. Ceramic grafting onto bones, rendering them virtually unbreakable.
2. Muscular enhancement.
3. Increased human growth.
4. Visual enhancement, including the ability to see clearly in the dark.
5. Superconducting fabrication of neural dendrites: altering bioelectrical nerve transduction to shielded electronic transduction. This results in a three hundred percent increase in the subject's reflexes. Anecdotal evidence suggests a marked increase in intelligence, memory, and creativity.
With nearly 30 years of active duty, he is one of the most decorated soldiers in the United Nations Space Command and has earned every known UNSC medal except the Prisoner of War Medallion.
He is more commonly known as "Spartan" by Thel and Rtas 'Vadum, "Demon" by the Covenant and other Sangheili, "Master Chief" and "Chief" by Humans, and "Reclaimer" by both 343 Guilty Spark and 2401 Penitent Tangent. Barely anyone calls him "John" except for Dr Halsey and Cortana.