RC-1207, nicknamed «Sev,» was an elite clone commando who was part of Delta Squad during the Clone Wars. At some point, he and his fellow commandos were sent into an engagement from a Low Altitude Assault Transport/infantry. In the battle, his squad‘s mission was to secure territory from enemy hands.
Sev and the other members of Delta Squad were sent Devaron in the aftermath of the battle waged there and recovered the bodies of Jedi Master Halsey and his Padawan, Knox, and returned them to Coruscant. The squad was met on the landing platform by Jedi High Council members Obi-Wan Kenobi, Plo Koon, Saesee Tiin, and Adi Gallia, who noted that the massacre was of similar caliber of the damage done by Asajj Ventress who was presumed dead. Security footage of the battle was recovered and included a hologram of Halsey’s death at the hands of an as-yet unknown assassin.
CT-9904, nicknamed «Crosshair,» 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 because of it, he acted as a sniper, taking advantage of his marksmanship skills.
Upon the activation of Order 66, Crosshair was the lone 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 remain loyal to the Empire, and was deployed against his former teammates with the military rank of Clone Commander.