AT-RT drivers replaced ARF troopers shortly before Episode 3. AT-RT drivers in the 41st Elite Corps saw action during the Battle of Kashyyyk, while others, like the 91st Reconnaissance Corps served in many other battles in the Clone Wars. AT-RT drivers of the 501st Legion were also present during the a battle on Umbara, and later on Kiros. After the implementation of Order 66, these troops helped hunt down surviving Wookiees and Jedi on Kashyyyk.