CT-66-3238 was a clone cadet who served in Bravo Squad, a training unit, early during the Clone Wars. He was marked with a three on his clone training armor.
CT-66-3238 was a clone of the bounty hunter Jango Fett who was born on the planet Kamino. Like his comrades, CT-66-3238 was made to serve in the Grand Army of the Republic. Early during the Clone Wars between the Galactic Republic and the Confederacy of Independent Systems, CT-66-3238 served in Bravo Squad, a squad of clone cadets training on Kamino. During their time in training, Bravo Squad managed to complete the practice exam in record time. When ARC trooper Commander Colt of Rancor Battalion arrived to watch over the final exams, Bravo Squad, along with Domino Squad and two other units, were summoned to a hangar in Tipoca City Military Complex for Colt's speech. During the speech, Colt selected Bravo Squad for the final test first due to their record time in completing the practice test.
Starting Citadel Challenge version THX variable 1138, CT-66-3238, CT-66-3339, and CT-27-3555 took the right flank while CT-66-3232 and CT-66-3233 took the left flank. CT-66-3232 directed CT-66-3238 and CT-66-3339 to move forward and engage the training battle droids while they followed close behind and the others provided cover fire. The squad moved up and eventually reached the base of the citadel. CT-66-3339 directed CT-66-3238 to move forward to the citadel while the rest of the squad provided cover fire. CT-66-3238 was able to rappel up and capture the light post, completing the exam. While exiting the arena, CT-66-3238 and his teammates passed the approaching Domino Squad and CT-66-3233 mocked them.
CT-66-3238 demonstrated teamwork skills, which helped them to pass the final exam. He was able to take directions and used his ascension cable to scale the citadel and capture the light post.
CT-66-3238 was equipped with clone training armor which contained the red coloring of Bravo Squad, the number three on his chest plate and left shoulder armor, had his designation on his left leg, and utilized a DC-15A blaster carbine with non-lethal bolts and an ascension cable.
This Bravo Squad cadet's identification number was first depicted in the episode "Clone Cadets" of Star Wars: The Clone Wars. It says 66-3238, and the prefix CT- was predetermined. This way of determining identification numbers was proved with the troopers in Domino Squad.
CT-66-3238's identification number can also on the armour for the third member of the unidentified squad of cadets with yellow markings.