CT-5555

CT-27-5555 also known as ARC-5555 and later redesignated as CT-5555 was a clone trooper who served in the Grand Army of The Republic during the Clone Wars. Because of his clone designation, he was given the nickname Fives. He started as a clone cadet, graduated and served as a rookie on the Rishi moon listening post. He, along with fellow trooper Echo, the only rookie survivors of the battle, were rewarded and given a place in the 501st Legion and helped defend Kamino. After the defense of Kamino, Fives and Echo were promoted to ARC troopers for their continuous efforts. Later in the war, he fought on Lola Sayu to rescue Jedi Master Even Piell. While Piell died and Echo was presumed dead, Fives and the surving members of the team were rescued by Plo Koon. Later in the war, He fought during the Battle of Umbara in which Pong Krell took command. He thought Krell was a traitor and was right when Krell worked against the Republic. Fives was also present on Ringo Vinda when Tup killed a Jedi General because of a malfunctioning biochip that triggered Protocol 66. Fives found evidence of the conspiracy, and tried to assassinate Chancellor Palpatine, but Commander Fox shot him before he could tell Captain Rex and Anakin Skywalker about Order 66. Fives died with the truth, but it was too late.

Clone cadet on Kamino
During the first year of the war, Fives, along with Droidbait, Hevy, Echo, and Cutup were clone cadets in Domino Squad. The other clones in Domino Squad called Fives by his number, CT-27-5555, although Fives would rather be called by his nickname. Domino Squad was reckless, and they rarely got along as a team. Their training was overseen by bounty hunters Bric and El-Les, and Jedi Master Shaak Ti. The cadets were given a test and to pass it, all cadets must successfully work as a team without any injuries, but during one of Domino Squad's combat simulation tests, Droidbait broke away from the group and was shot. El-Les and Colt ended their test, and Domino Squad automatically failed that test.

The cadets went to their sleeping quarters, but Fives and fellow cadet Echo went to Shaak Ti and asked for a transfer to a new squad. Ti declined their request, and she revealed she had faith within Domino Squad. Shaak Ti let the cadets retake the test. During the test, Fives, along with his squadmates, noticed that they did not have their ascension cables. The clones decided to free-climb the turrets up to the citadel's roof. Hevy lifted the pole atop the citadel, and the cadets finished their test. Ti and El-Les commended Domino Squad's efforts, and all 5 cadets were given medals as a symbol for their graduation from clone cadet, but most importantly, they were ready for battle.

Service on the Rishi moon
Four of the rookies that were in Domino Squad, Hevy, Cutup, Droidbait, and Echo, were given their first assignment on the Rishi moon listening post, along with Fives, but Fives came when Captain Rex and Commander Cody came to inspect the post.