Clone Trooper 8615, or Uno, was a member of the 501st. He was part of the Pax Squad and worked closely with them under Jedi General Anakin Skywalker and his padawan, Ahsoka Tano.

Half of Pax Squad was wiped out during the siege of Umbara, including Uno's closest brother; CT 8614, or Torque.

After this loss, Uno kept fighting until the Siege of Mandolore, when he donned a newly designed helmet to fight under Commander Tano.

He survived the original attack, but was devastated when the Star Destroyer the others of his squad were on crashed after Order 66. Uno was immediately wary of the Empire.

After a few months, rumors reached Uno that not only had Clone Force 99 defected, but Captain Rex was alive. He decided he had to flee, and went off to find Rex.

Uno soon arrived at Tatooine to hide from his imperial pursuers. There he met a former padawan named Kaal Yun. They quickly became friends, and Uno swore to protect him to right his wrongs during Order 66.

Uno would later sacrifice himself so Kaal could escape the Grand Inquisitor. His last words were "Don't look back" as the red lightsaber was stabbed into his back and through his heart.