Jimmon Arbmab, designated as HC-4120, was a human male who served as an Imperial combat assault tank commander within the ranks of the Imperial Hammers Elite Armor Unit. Holding the rank of First Sergeant, Arbmab commanded a TX-225 GAVw "Occupier" combat assault tank through the streets of Jedha City when Saw Gerrera's Partisans launched an ambush against his tank. During the subsequent battle, Arbmab met his death after being struck by a blast originating from Cassian Andor's A280-CFE.
Jimmon Arbmab, a human male, was a member of the Galactic Empire forces, serving as an Imperial combat assault tank commander. His designation was HC-4120, and he was a part of the Imperial Hammers Elite Armor Unit. Arbmab achieved the rank of First Sergeant before being deployed with his unit to Jedha, a moon located in the Mid Rim.
While stationed on this desert moon, he and his tank crew were tasked with providing security for the transport of kyber crystals being shipped out of Jedha City, the moon's primary urban center. Shortly before the Empire withdrew all of its forces from the moon, Arbmab and his crew were assigned to a kyber transport detail. This detail consisted of his tank and a squad of stormtroopers. The tank and its escort were then ambushed by partisans who were loyal to the rebel leader Saw Gerrera. Many of the escort members were killed, including Arbmab, after Cassian Andor, a spy working for the Rebel Alliance, shot the tank commander from a position on the tank.
Louis Samms played Jimmon Arbmab, without credit, in the 2016 Anthology movie, Rogue One: A Star Wars Story. His identity was first revealed in the reference book Star Wars: Rogue One: The Ultimate Visual Guide, authored by Pablo Hidalgo, which was released alongside the film. The character of Arbmab can be traced back to the 1989 Star Wars Legends short story The Assault on Protazk, featured in the Imperial Sourcebook role-playing reference, penned by Greg Gorden for the Star Wars: The Roleplaying Game.