What is Noble Six’s real name?

What is Noble Six’s real name? (Lieutenant) Natalie-B312 (born July 23rd, 2533), known later as Noble Six or by ONI records as Codename CHAPEL, was a SPARTAN-III commando and member of Beta Company in the UNSC, and of Naval Special Warfare Command.

(Lieutenant) Natalie-B312 (born July 23rd, 2533), known later as Noble Six or by ONI records as Codename CHAPEL, was a SPARTAN-III commando and member of Beta Company in the UNSC, and of Naval Special Warfare Command.