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.
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All you meat bags look the same to me. Not all droids are suited for combat, but I am a ruthless killing machine, and you will eat your words when you get disintegrated by my arc blade.