ARC-25-347168, nicknamed Arc, secretly designated CT-1 and ARC-1, was the first clone from the DNA of Exhart Martineus, and the first ever clone trooper bred for the formation of the Great Clone Forces in order to serve the Galactic Republic during the Second Clone Wars. He led the First Division and ultimately the whole clone army. His closest friends were fellow troopers Longman and Aft. Arc was also good friends with other members of the First Division and always formed friendships with other troopers he met throughout the war.