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From Halopedia, the Halo wiki
Catherine Elizabeth Halsey is a key scientific adviser of the Office of Naval Intelligence, best known for her work with the SPARTAN-II Program, developing and creating smart AIs, and for overseeing the development of the MJOLNIR Powered Assault Armor. She held considerable authority and respect within ONI, though she endured intense personal guilt for condemning the Spartans to the life of a super soldier.
