AT - series The AT - series was an series of multi - legged walker . AT stood for All Terrain . Both the Galactic Republic and the Galactic Empire was two well - known uses of the series . Galactic Republic walkers . AT - AP . The AT - AP was a three - legged walker initially used by the Galactic Republic during the Clone Wars . They were later used by the Alliance to Restore the Republic during the Galactic Civil War against the Galactic Empire . All Terrain Tactical Enforcer . The All Terrain Tactical Enforcer ( AT - TE ) was a hexapodal walker used by the Galactic Republic during the Clone Wars . The walker had six laser cannon turrets , a heavy projectile mass - driver cannon , and legs that could be magnetized to climb up and down walls . All Terrain Recon Transport . The All Terrain Recon Transport ( AT - RT ) was a small bipedal walker used by the Galactic Republic during the Clone Wars . The walker had an open cockpit , and a single chin - mounted laser cannon . Two of these could be stored in the back of an AT - TE . All Terrain Open Transport . The All Terrain Open Transport ( AT - OT ) was an octapodal walker used by the Galactic Republic toward the end of the Clone Wars . Its open top allowed it to transport more troopers across the battlefield . Imperial walkers . All Terrain Armored Transport . The All Terrain Armored Transport ( AT - AT ) was a quadrupedal walker used by the Galactic Empire after the fall of the Galactic Republic . With a height of 22 . 5 meter s the walker relied heavily on intimidation . All Terrain Armored Cargo Transport . The All Terrain Armored Cargo Transport ( AT - ACT ) was a quadrupedal walker used by the Galactic Empire that featured a dedicated cargo bed for the transportation of heavy building materials or combat munitions . These vehicles shared a similar design with the AT - AT except that they were larger to accomadate storage space and featured less weaponry . All Terrain Defense Pod . The All Terrain Defense Pod ( AT - DP ) was a bipedal walker used by the Galactic Empire primarily for patrols and scouting missions . The walker could seat two crew members ; a driver and a gunner . A variant of the AT - DP was the AT - DP Arc Cannon Prototype , which carried the Arc Pulse Generator , a superweapon . All Terrain Missile Platform . The All Terrain Missile Platform ( AT - MP ) was a bipedal walker used by the Galactic Empire 5 years after the Battle of Yavin . The AT - MP was heavily armed with missiles and had an even heavier variant ; the AT - MP Mark III . All Terrain Scout Transport . The All Terrain Scout Transport ( AT - ST ) was a bipedal walker used by the Empire as means to eliminate smaller forces . They were often deployed along with the larger AT - ATs to back them up and eliminate smaller forces . The AT - ST had a more heavily - armored variant known as the AT - ST Mark III . AT - PT . The AT - PT was a bipedal walker used by the Galactic Empire during the Galactic Civil War , against the Rebel Alliance . First Order walkers . All Terrain MegaCaliber Six . The All Terrain MegaCaliber Six was a walker utilized by the First Order during their conflict with the Resistance . All Terrain Mobile Artillery . Sometime after the Battle of Jakku , the First Order , a military organization led by Supreme Leader Snoke , developed a model of four - legged All Terrain Mobile Artillery s . These walkers were used by the First Order in defense of Starkiller Base . All Terrain Patrol Droid . A droid walker used by the First Order to patrol Starkiller Base