ARC-7647 or "Rex Jr" was a Clone Rookie in clone group Purple Squad before it went Golden. Rex Jr. was a very skilled. Jr. was best friends with ARC-5688. "Jr!" said Quinn "Yeah?" "You are one the best rookies i've seen in awhile you cannot just be a rookie any more.." "I don't know I never got promoted from rookie.." "Well since I have the power to do it..I promoted from Rookie to Corporal." "Thank you sir.." "Anytime Corp".. Jr was the youngest and the most skilled at shooting but could be sometimes very clumsy. He dropped many grenades at one time in battle but survived.