A carefully selected team of elite Imperial shock troopers, led by Clone Commander Thire, was quickly put together after Emperor Palpatine sensed that his new Sith apprentice, Darth Vader, was in peril. This team journeyed to Mustafar on a Theta-class T-2c shuttle with the Emperor to locate Vader. CC-4477, along with two other troopers, discovered Vader close to a lava flow and departed under the Emperor's instructions to retrieve a medical capsule.
During the early years of the Galactic Empire's reign, Thire's unit of Imperial shock troopers consisted of clones wearing Phase II clone trooper armor that was painted red. This color indicated their role as shock troopers within the Coruscant Guard. The unit was known to utilize blasters such as the DC-15A blaster carbine and the DC-15A blaster rifle.
After Grand Master Yoda's failed attempt to stop the newly appointed Emperor Palpatine, the Sith Lord felt his apprentice, Darth Vader, was in danger. Palpatine left Coruscant for Mustafar aboard a Theta-class T-2c shuttle, accompanied by a team of Imperial shock troopers under Commander Thire's command. Upon their arrival on the planet, the Emperor, along with two shock troopers, searched the edge of a lava river for his apprentice. After locating his injured Sith apprentice, Palpatine ordered the two troopers to return to the shuttle and bring back a medical capsule, which they did.