The All Terrain Anti-Aircraft (AT-AA) walker is a quick moving, quadrupedal mobile anti-aircraft walker used by the Galactic Empire. The AT-AA's four stubby legs, lizard-like locomotion, and a low profile not seen in other Imperial walkers, makes them harder targets for aircraft. The AT-AA's squat gait is a result of it having to support the heavy weight of a flak pod or missile launcher mounted on its back.