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AT-AT commanders were Imperial Army officers who were placed in command of the Empire's All Terrain Armored Transports. AT-AT commanders served as the leader of the command crew of an AT-AT, overseeing the pilot and gunner.[1] Commanders used the vehicle's electrorangefinder to accurately direct the walker's weapons fire.[2]
Sources
Star Wars Customizable Card Game — Hoth Limited Card: Electro-Rangefinder (backup link)- Star Wars: Imperial Handbook: A Commander's Guide