Apollo lunar rover lug nut mission specialist?
SR-71 Blackbird in-flight exhaust sampling/adjustment bot?
Brent cannot remember because his memory was wiped when he was decommissioned in 1979. But, while napping, occasionally his chest light flutters on and he can be heard to mutter things like "...must access nozzle five-niner-bravo...," "...wing nut 14 secured and ready, Captain..." or "METRIC?! Good one, sir!"