CT-5555, also referred to as ARC-5555 and previously designated as CT-27-5555, was a clone trooper who served in the Grand Army of the Republic during the Clone Wars. Due to his clone designation, he was given the nickname "Fives." Originally a clone cadet during the early phase of the pan-galactic conflict between the Galactic Republic and Confederacy of Independent Systems, Fives completed his training on Kamino and attained the rank of trooper alongside his teammates in Domino Squad. As a newly-trained soldier, he was stationed in a Republic outpost on the Rishi moon at the time of a Separatist attack on the installation. As one of only two survivors, Fives was recruited into the 501st Legion. Following the successful defense of Kamino, he joined the ranks of the elite Advanced Recon Co