(All-Terrain Experimental Transport)
The AT-XT developed by the Old Republic for use during the Clone Wars, the All-Terrain Experimental Transport walker was considered by some as the predecessor to the modern AT-ST scout. They were developed as smaller counterparts to the AT-TE tank, for deployment into cramped battle arenas.
Although its acronym supposedly means “All Terrain experimental Transport”, the walker was deployed in appreciable numbers on several of the Wars' battlefields, including Jabiim, Rhen Var, Raxus Prime and Thule. The design remained unchanging during this period. Thus the walker cannot truly be called an experiment. However, because the designers at Rothana Heavy Engineering were continually revising its design, the AT-XT never saw its full production potential. It is sometimes claimed that AT-XT numbers were small, yet there isn't any supportive statistical evidence.
The AT-XT is also not necessarily the ancestor of the AT-ST. In engineering terms this cannot be true, since there two designs do not have any significant parts in common. The AT-XT was certainly designed for the conditions of its era, and not merely as a step towards an anticipated successor. The vehicles share broad similarities, but there are particular structural and functional differences that imply subtly different battlefield roles.
The AT-XT can be driven by just one crewman, but the availability of passenger space is unknown. The armament consists of a double laser canon under the cockpit, and two grenade launchers on the top of the head. The launchers are considerably larger than the one on an AT-ST. The most peculiar feature of the AT-XT is a deflector shield resembling those mounted in destroyer droids. This shield can only be activated briefly. The AT-XT is better suited to front-line warfare than the typical scout role of an AT-ST.