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
Technology in Star Wars by the thousands, if desired. The clones in "Star Wars" can also be genetically altered during their pre-birth phase to have their growth hormones and learning abilities accelerated, as well as their independence and self-consciousness restricted. According to Jeanne Cavelos, a science fiction writer and former NASA astrophysicist, who is also author of the book "The Science of Star Wars", all of this is future possibility with the progress of science and technology. What is "not" possible according to her is the ability to accelerate either the growth of clones, or their ability to learn faster. According to Webster's dictionary,