Clone trooper film series and in the "Star Wars" expanded universe media, a number of specialized trooper units are seen, including elite special forces units such as the 'Advanced Reconnaissance Commandos' (ARC troopers), and Null ARCs, who usually work alone. All clone commandos and ARCs were trained by Mandalorian mercenaries; the elite Clone Troopers are known as Shadow Troopers. The style and color of a clone troopers armor often varies depending on their rank, specialization, unit, or environment, for example, the clone troopers on Kashyyyk wear camouflage green scout-style armour whereas the 501st legion wears standard white armor with blue accents. Another
Star Wars: Dark Forces mines where minerals are extracted for the Dark Troopers. After learning of [[List of Star Wars characters#M|Crix Madine]]'s (a former Imperial Commander, who had defected to the Alliance) capture and imminent execution, Kyle proceeds to a high security detention center on [[Orinackra]] to rescue him. Madine provides the Rebel Alliance with information about the smuggling of Dark Trooper materials, leading Katarn to investigate the Ramsees Hed docking port on Cal-Seti. He then destroys a robotics facility on the icy planet Anteevy, the second stage of the Dark Trooper production line. After being captured by Jabba the Hutt and having to