In-universe, the clone troopers serve as the military of the Galactic Republic, created in the wake of the Confederacy of Independent Systems’ formation, which threatened the galactic peace established by the Republic. The three-year conflict between the clones and the Separatists’ battle droid armies is known as the “Clone Wars”, in reference to the former, and was secretly orchestrated by the Republic’s Chancellor Palpatine to seize power and transform the Republic into the Galactic Empire. All clone troopers are humans, bred from the DNA of their genetic template, the bounty hunter Jango Fett, at the cloning facilities on Kamino, run by the native Kaminoans, who genetically modified the clones to display unquestioned obedience to the higher chain of command, and age at twice the rate of a normal human. During the Clone Wars, they served under the command of the Jedi Order, but ultimately turned on them and killed them, as a result of Palpatine issuing Order 66, which branded the Jedi as traitors and ordered their deaths. The nature of Order 66 is explored in more detail in The Clone Wars animated series, which reveals that Palpatine had secretly arranged for the Clone Army’s creation almost a decade before the Clone Wars, and ordered that all clones be outfitted with inhibitor chips, which would alter their mentality and force them to carry out Order 66 unquestionably. Following the formation of the Empire, clone troopers became more and more uncommon as they were slowly replaced by stormtroopers. At the time of the original Star Wars trilogy, the 501st Legion, aka “Vader’s Fist”, was the only known branch of the Imperial Army to consist mostly of former clone troopers.

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