Agile and lightweight - AT-RT walkers can move through challenging terrain to scout out the enemy's presence. The walkers are also used to patrol borders - giving their clone trooper drivers more mobility and better visibility than they would have on a foot patrol. AT-RT walkers are deployed during the Battle of Kashyyyk against the droid armies that attempt to take control of the jungle homeworld of the Wookiees.
Commanders in the clone army are bred for leadership positions with more capability for the independent thought required for decision making. Clone commanders assist the Jedi Generals on missions during the Clone Wars.