args.bungie.org

Could it be that Adjutant Reflex is in actuality a cataloging AI. Held on the Ark and designed to come forth and accumulate all data on the current/past state(s) of the current Forerunner descendant civilization before all sentient life in the galaxy is purged once more? He could be called out each time the installations are prepared to fire, record their past and present information so that in the situation that one day a descendant civilization does manage to discover the knowledge stored within they can truly know and understand their past. The hardships and lessons learned by their ancestors.

I'm partial to a theory I read once before about how Humans are supposed to know a lot more than they do. That they are in fact Forerunner descendents and that they were supposed to learn of their heritage early on, but something in the process screwed up and so now we are ignorant.