No, exos were decommissioned...they were recently and mysteriously rebooted with no memories if their past
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indeed, lore hints they where a result of mankind trying to bolster it´s ranks back in the great war with the darkness and the guardians are units that was downed during this war, like all other guardians "resurrected"
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I am a Unit. Always have been, always will be.
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Oh ok thanks for clarification