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
Changes in Star Wars re-releases Changes in Star Wars re-releases Changes in "Star Wars" re-releases vary from minor differences in color timing, audio mixing, and take choices to major insertions of new visual effects, additions of characters and dialogue, scene expansions, and replacement of original cast members with newer ones. Though changes were also made to the prequel trilogy, the original trilogy saw the most alteration. Dissatisfied with the original theatrical cuts of the original "Star Wars" film, "The Empire Strikes Back", and "Return of the Jedi", creator George Lucas altered the films in an attempt to achieve the ideal versions that he could not