who is master chief who is master chief?
Edit Page Last Edit: 3 years 8 months ago. John-117, Master Chief, Siera 117, was born on the human colony world of Eridanus II. At the age of 6, he was taken from his parents and replaced by a clone who died shortly after. John-117 was then drafted into the UNSC navy with a select group of children for the SPARTAN-II program.