- "AT-ST's will no longer be deployed on planets with an abundance of trees or other known obstacles such as rock-wielding primitives."
- — AT-ST service manuals, post-Battle of Endor
The All Terrain Scout Transport (AT-ST) is a bipedal walker used by the Galactic Republic during the Clone Wars and, later and more extensively, the Galactic Empire. Also known as a "chicken walker" because of its shape and walking motion, the AT-ST is a heavily armed light ground combat vehicle.
It is equipped with a chin-mounted double medium laser cannon, a concussion grenade launcher on the starboard side of its head, and a blaster cannon on the port side. The chin guns have an effective range of two kilometers and are used for anti-vehicle attacks, while the blaster cannon and grenade launcher provide close-range protection. The walker’s armor is strong enough to protect it against infantry, but not against other assault craft with heavier weapons.
The AT-ST’s bipedal propulsion system is one of the primary weaknesses of the walker. On even terrain the walker can achieve over 90 kilometers per hour, but on uneven or shifting terrain an AT-ST can quickly become unbalanced enough to fall over. The system is also relatively fragile and can be disabled or destroyed with the right shot.
Early on in the Clone Wars, engineers at Rothana were busy developing a new bipedal walker, dubbed the All Terrain Scout Transport, following their construction and testing of the AT-XT. The AT-XT enjoyed moderate success during its somewhat brief operational time, but was rarely used during the war.
The earliest AT-ST models would be deployed by the Grand Army of the Republic during the latter stages of the Clone Wars. The conflict would also see the debut of several other bipedal walker designs, like the AT-RT.
Under the Empire, Balmorra became the center of AT-ST production. The AT-ST was later viewed by Imperial commanders as a highly versatile weapon, excelling against infantry and lightly armored vehicles, but also useful for protecting vital units and patrolling hostile areas.