The AAT driver battle droid was a specialized variant of B1 Battle Droid that was programmed to operate AATs. AAT drivers could be identified by the green markings throughout their bodies. Unlike most battle droids, AAT drivers depended on operating vehicles in battle and did not serve as foot soldiers.
Several AAT drivers were present during Yoda and Lieutenant Thire's mission to Rugosa. They were ordered by Asajj Ventress to stop them, however all were effortlessly defeated by Yoda.
A single AAT driver battle droid could be seen standing near Count Dooku and a Tactical Droid on the planet of Kiros. It later took orders from Darts D'Nar.