Clone troopers were an army of identical, genetically-modified clones, created to serve in the Grand Army of the Republic during the full-scale intergalactic conflict that came to be known as the Clone Wars. Grown at an accelerated rate and raised in the laboratories and facilities of Kamino, the clone troopers were trained throughout the first ten years of their lives to become one of the most efficient military forces in galactic history. Bred for the sole purpose of combat, the clones were indoctrinated with unwavering obedience to the Galactic Republic and—more specifically—their Commander-in-Chief, the Supreme Chancellor.

For roughly three years, the clone troopers fought to defend Republic sovereignty against the Separatist rebellion. Throughout the conflict, the members of the Jedi Order served as commanders and generals of the Grand Army and, thus, they served alongside their clone soldiers on many occasions. However, the covert Sith plot to seize control of the galaxy, masterminded by the Sith Lord Darth Sidious, effectively caused the clones to betray and destroy the Republic that they were sworn to protect with their lives. Sidious, in his public guise as Chancellor Palpatine, issued Order 66 to the clone troopers on the eve of the Clone Wars' end.