GDC 2002, Creating the Illusion of Intelligence: Where AI and Level Design Overlap in Halo’s AI.
Chris Butcher and Jaime Griesemer speak about the design goals, theory and implementation of the AI and large scale battles in Halo 1 Combat Evolved.

Resources:

GDC Vault, session audio
https://www.gdcvault.com/play/1022590...

Slides and notes
https://halo.bungie.org/misc/gdc.2002...

Notes:
The footage shown during the demo section of the video is my own substitute footage. I couldn't find any footage from the actual talk. I tried to record footage that was relevant to the content of the talk.