Genetically defective clone

Genetically defective clones, designated as CT-99s or alternatively known as defective clone troopers (DCTs), were clone troopers who had altered genes as a result of the cloning process. While the physically impaired Clone 99 was relegated to the tasks of a maintenance duty clone, the members of Clone Force 99—Clone Sergeant Hunter, Wrecker, Tech, and Crosshair—each possessed unique mutations that allowed them to serve as specialist soldiers in the Grand Army of the Republic during the Clone Wars. Due to the genetic mutations of the Bad Batch affecting their inhibitor chips, they were not obliged to abide by Order 66, issued by Supreme Chancellor Palpatine at the end of the war so that the clones of the Galactic Republic would kill their Jedi commanders. Nevertheless, Crosshair chose to follow orders and be loyal to the Galactic Empire that succeeded the Galactic Republic.

Muzzle was a defective clone who served as an Advanced Recon Commando and later deserted the Republic to secretly lead the Aurodium Sword, a company of mercenaries, during the Clone Wars. Defying the Empire, the other members of Clone Force 99 extracted the clone deserter Gregor from an Imperial base on Daro. Gregor initially assumed that they were clone commandos like him until Hunter identified his squad as CT-99s, indicating that they were genetically defective clones.