The All Terrain Recon Transport (AT-RT), also known as the Republic scout walker, was a model of recon walker used mainly during the Clone Wars by Advanced Recon Force troopers. It was the precursor to both the All Terrain Defense Pod and the All Terrain Scout Transport. During the Galactic Civil War, these walkers were adopted by both the Galactic Empire, who used Scout troopers to man the vehicles, and the Alliance to Restore the Republic, who upgraded them to compete with the advancements of the Empire.