7/24/2014 4:23:23 AM PermalinkAs stated by other people, the individuals you are referring to are likely robots who are [i]not[/i] Exos. Moreover, Exos are sentient, individual beings, therefore putting them in any sort of set "role" or "box" or making societal generalizations about them is morally wrong.
I've seen lots of exos in the tower with serving jobs like being a post person, cleaning, or being a guide. I feel like this is the proper role for all exos as I don't think they are very adept in combat. Whenever I see exos in the crucible I feel like I should destroy their ghost as well so I can dismantle the exo and use their parts to upgrade my weapons.