Hunter
Hunter was a former clone commando sergeant who served as the commanding officer of Clone Force 99 in the Grand Army of the Republic during the Clone Wars, fought between the Galactic Republic and the Confederacy of Independent Systems. He was genetically altered to have heightened senses and commanded his comrades who had their own unique mutations, in what they called the "Bad Batch." Other members of the squad included Wrecker, Tech, and Crosshair, and later, Echo.
Wrecker
Wrecker was a clone commando who served in the Grand Army of the Republic during the Clone Wars as part of Clone Force 99. Due to genetic mutations, Wrecker was much larger and stronger than the average clone trooper. He loved blowing things up, and served as the muscle and demolitions expert for his squad, which was nicknamed the "Bad Batch". Wrecker lived through many dangerous missions during the Clone Wars, including the Battle of Anaxes in the last year of the war. He and his squad-mates were partaking in the Conquest of Kaller when Order 66 was initiated, and as Wrecker, Hunter, Tech, and Echo remained unaffected (Crosshair was affected but had some level of resistance to the order), they watched with much confusion as their clone brothers turned on the Jedi.
Tech
Tech was a clone commando who served in the Grand Army of the Republic during the Clone Wars as a member of Clone Force 99, also known as the "Bad Batch," and who later deserted the Galactic Empire. Due to his genetic mutations, he appeared leaner, fairer, and younger than his fellow clone troopers. Tech served as the brains of his squad and was a valued asset in this regard, using his high intellect and mastery of technology to ensure their operations were successful. Even so, he was no less skilled in combat than the other three members.
Crosshair
Crosshair, formerly designated CT-9904, was a clone commando who served in the Grand Army of the Republic during the Clone Wars as part of Clone Force 99. Crosshair possessed genetic mutations that gave him exceptional eyesight and marksmanship skills. As a result, he acted as a sniper and a long-range combatant. Upon the activation of Order 66, Crosshair was the sole member of Clone Force 99 that attempted to carry out the order. Frustrated with his team's disregard for the rise of the Galactic Empire, Crosshair was eventually selected by Governor Wilhuff Tarkin to be deployed against his former teammates and was given the military rank of Clone Commander.