Joopa Base was a re-engineered AT-AT, initially an All Terrain Armored Transport, that was transformed into a mobile command center by the clones Gregor and Wolffe. This AT-AT was once under the control of Agent Kallus, who dispatched it to eliminate Rex and the Ghost Crew after Wolffe reported their presence. Despite the destruction of the clones' AT-TE, the rebels seized control of this walker, eliminating the remaining Imperial walkers. Following the battle, Rex enlisted in the Rebellion, while Wolffe and Gregor chose to stay on Seelos, utilizing this very walker as their new residence, which they dubbed "Joopa Base." As time passed, they incorporated components from their previous AT-TE to enhance their new dwelling, notably adding a landing platform. The Wolfpack's symbol was prominently displayed on the side of Joopa Base.