This specialized group of storm clone troopers'or shock troopers,they are fictional characters from  star wars they were used by Darth Vader during the Great Jedi Purge and order 66, also in the invasion of the Jedi temple; these troopers are clones of a fallen bounty hunter name Jango Fett.After the battle at the Jedi temple they served as Darth Vader's private army of troopers; Darth Vader used these troopers during many of his missions for the emperor and during many conflicts and even in the Galactic Civil War.They wore blue strips and armour similar to the ones wored by the imperial stormtrooper and the newly created  imperial officer.they were called the 501st legions of storm/clone troopers, Vader's fist and might of Vader. The elite troopers of this organization would be used for important missions for the empire and also the best troopers were promoted to higher ranks in the imperial army.Darth Vader and Commander Appo led the troopers to attack and kill all the Jedi in the temple which was ordered by Emperor Palpatine whose now known as Darth Sidious.The clone troopers now known as stormtroopers who wore white and black armour they were seen in a new hope during an attack on princess Leia's tantive 4 rebel ship. There ranks and ribbon insignias are colored in red meaning clone captains, the blue represents lieutenants the yellow is the commander the highests ranks for the 501st legions and any trooper and green were the sergeants. The clone troopers used this until the end of the clone wars.The troopers used by Vader are called the 501st legion there armour are blue but there ranks are small satches on their shoulders they wore red for lieutenants, yellow and blue for commanders and they didn't have any green insignias which are sergeants but they had blue,red, and yellow for their commanding sergeants. They were stationed on Vader's super star destroyer called The Executor and on Coruscant, as well as other parts of the galaxy.