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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.
That's a big shock, considering he's a hero to all of mankind. What could Master Chief have done to provoke this manhunt? In one commercial for the game, we see a UNSC representative announce that Master Chief has been killed in action. Is that just propaganda or will we see Chief go through yet another near-death experience? We'll find out in Halo 5.