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 limited abilities of current robots, Dr. Jonathan Roberts, director of CSTRO Autonomous Systems Laboratory, proclaims that the role of robots in assisting humans is going to increase, similarly to what is seen in "Star Wars". The Christian Science Monitor reported in 2011 that an American blogger, out of patriotism, tried to raise money to build a robotic AT-AT for the US military. Heikko Hoffman, a robotics expert from HRL Laboratories, who was not associated with the project, claims that AT-ATs are possible, though some of their designs should be changed from those seen in the "Star Wars" universe, for safety,