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Master Chief Petty Officer John-117, or more commonly known as the Master Chief, is a Spartan-II commando of the UNSC Naval Special Warfare Command who became one of the most important UNSC heroes during the Human-Covenant war.
I don't know why, but there is one thing about the book that has always bothered me. According to the beginning of the novel, John (Spartan 117) was born in 2511. When the fall of Reach happens in 2552, that would make the Master Chief 41 years old.