Jimmon Arbmab, referred to as HC-4120, was a male human serving 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, where his tank was caught in an ambush set by Saw Gerrera's Partisans. During the subsequent battle, Arbmab met his death when struck by a blast originating from Cassian Andor's A280-CFE.
Jimmon Arbmab, a male human, served the Galactic Empire as an Imperial combat assault tank commander. He was designated HC-4120 and was a member of the Imperial Hammers Elite Armor Unit. Arbmab achieved the rank of First Sergeant and was deployed with his unit to the moon of Jedha, located in the Mid Rim.
While stationed on the desert moon, Arbmab 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. Not long before the Empire withdrew all its forces from Jedha, Arbmab and his crew were part of a kyber transport detail consisting of their tank and a squad of stormtroopers. The tank and its escort were then ambushed by partisans who were loyal to Saw Gerrera, the rebel leader. Many members of the escort were killed, including Arbmab, when Cassian Andor, a spy working for the Rebel Alliance, fatally shot the tank commander from his position on the tank.
Louis Samms played Jimmon Arbmab, though he was uncredited, in the 2016 Anthology film Rogue One: A Star Wars Story. The character's name was first revealed in Star Wars: Rogue One: The Ultimate Visual Guide, a reference book written by Pablo Hidalgo that was released alongside the film. The character of Arbmab has his origins in the 1989 Star Wars Legends short story, titled The Assault on Protazk, which was featured in the Imperial Sourcebook, a role-playing reference book written by Greg Gorden for the Star Wars: The Roleplaying Game.