From a 1982 Kenner in-package catalog:
"Attack the Rebel Base with SCOUT WALKER. Head swivels to locate enemies, side cannons turn and click, and there's room inside for an action figure. Push remote button to make legs move and attack rebel defenses. SCOUT WALKER stands unassisted. Available Summer 1982."
The best feature of this vehicle is the walking action. At the rear of the AT-ST is a two-position selector button. When in the "walk" position, the AT-ST's legs alternate up and down with the press of a button. While in the "stand" position, the legs lock in place allowing the Scout Walker to stand unassisted.