Maintenance duty clones, alternatively referred to as maintenance troopers or maintenance clones, were clones derived from the genetic template of bounty hunter Jango Fett. Unlike their clone troopers counterparts who engaged in active combat, they were tasked with performing maintenance tasks, such as functioning as a janitor. One such clone, known as 99, served as a maintenance clone due to genetic and physical abnormalities resulting from cloning errors. He spent the remainder of his life on Kamino, fulfilling the role of a maintenance clone.