The AMX-102 Zssa is a rear support mass production mobile suit developed by Neo Zeon for its Earth invasion operation during the First Neo Zeon War in U.C.0088. It was designed with the concept of a mobile suit with large mobile armor-like heavy firepower. As such, it was equipped with a large number of missiles in its stocky body, while keeping close combat weapons to a minimum. It can also be equipped with an optional booster pod that not only provides the mobile suit with additional thrusters and flight ability in the atmosphere, but is also armed with additional missiles. The Zssa was envisioned to partner the AMX-101 Galluss-J in combat, providing fire support from the rear as the latter engages in close combat. In U.C.0096, the Zssas operated by the Neo Zeon remnant group, Sleeves, borrowed portable weapons of other mobile suits to compensate for their relatively weak anti-mobile suit capabilities, enabling them to serve more than a support role in combat.
In U.C. 0096, a number of Zssa survived and were used by the Sleeves during the Laplace Incident. They were repainted in dark green color scheme and given the distinctive markings featured on many of the mobile suits used by the Sleeves. During the Battle of Industrial 7, the Sleeves deploy their Zssa units to combat the forces of the SCVA-76 Nahel Argama. The AMX-101E Schuzrum-Galluss used a Zssa's booster pod to transport itself to the Nahel Argama for a direct attack on the battleship, and was supported by a Zssa armed with a shotgun when battling the ship's mobile suits.