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: The Clone Wars (film) was composed by Kevin Kiner. The original motion picture soundtrack was released by Sony Classical on August 12, 2008. The disc begins with the main theme by John Williams, followed by more than 30 separate music cues composed by Kiner. Kiner is known for his work on such television series as "Stargate SG-1", "", "Superboy" and "". The soundtrack uses some instruments never heard before in a "Star Wars" score, including erhus, duduks and ouds. "Star Wars: The Clone Wars" merchandise was first released on July 26, 2008. Hasbro released several 3-inch "Clone Wars" action figures, an electronic clone trooper