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Echo (CT-1409) is a soldier of the 501st Legion and the last surviving member of Domino Squad in Star Wars: The Clone Wars.
He, Fives, and three other clone cadets were members of Domino Squad; a fireteam that was on the verge of being decommissioned on account of their constant failures in their training exercises. He was brought into the 501st Legion by Captain Rex after the downfall of his own squadron. During the mission of the Citadel, Echo was thought to have been killed, but was actually taken prisoner by the Separatists before he was rescued by Rex and Clone Force 99, which Echo later joined after helping save Anaxes from falling to Separatist control.
He had an tendency to repeat his orders to his teammates during their trials, regardless of if they actually heard them in the first place.