Echo, or officially CT-21-0408, was a clone trooper who fought during the Clone Wars. He belonged to the Clone squad Domino Squadduring his training days, and though he barely made it out in to the field, he made it to be a high ranking member of the 501st Legion. He was given the nickname "Echo" because of his tendency to repeat orders, and always had a strong passion of reaching the rank of ARC Trooper, which he eventually did. He fought alongside his only other remaining brother of Domino Squad Fives; many times. They fought together side by side until they were both assigned on the deadly mission of infiltrating and rescuing Jedi Master Even Piell on Lola Sayu. The shuttle Echo was protecting was shot by an operated turret causing a huge explosion which made Echo go flying from the explosion and he was presumed dead. The turret operated by aCommando droid on Lolo Sayu were both destroyed as well in the process.