5 Non-canon and dubious canon appearancesīiography Early life and education.

1.24 The artifact from Sigma Octanus IV.

1.22 Xenoarchaeology and other investigations.

After almost a year among the enemy, she was recaptured by the UNSC and commissioned to work on urgent scientific matters, particularly concerning the rise of the Guardians. Halsey was stripped of her position, incarcerated, and treated as a war criminal by the UNSC at large, which led to her apparent defection to Jul 'Mdama's reformed Covenant. Though generally well-regarded among her peers, she endured intense personal guilt for condemning the Spartans to the life of a super soldier.

Halsey held considerable authority within ONI, despite being a civilian, and commanded respect from important military figures. She served as a scientific adviser for ONI from 2515 to 2522, when she was made chief scientist, a position she held until the end of the Human-Covenant War. ĭoctor Catherine Elizabeth Halsey, (Civilian Consultant 409871, phonetically identified as ' Charlie Hotel'), 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 such as Cortana, and for overseeing the development of the MJOLNIR Powered Assault Armor. I should have been trying to save every single human life-no matter what it cost.' - Catherine Halsey to John-117 regarding her changed views. But now I'm not sure that philosophy has worked out too well.

I have killed and maimed and caused a great deal of suffering to many people-all in the name of self-preservation. ' For a long time I had thought that we had to sacrifice a few for the good of the entire human race.

53 kilograms (117 lb) (post-amputation).

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