CT-1409—nicknamed "Echo"—was a clone trooper who served the Grand Army of the Galactic Republic during the Clone Wars. Born on Kamino, Echo was originally identified as CT-21-0408, a cadet of the Domino Squad along with his friend Fives, before he graduated into the Republic army. On his first assignment, Echo was tasked with guarding the Rishi Station moon base, where he, along with Fives and the Clone Captain Rex, aided in warning the Republic of an impending Separatist attack on Kamino. Echo was commended for his bravery and absorbed into the 501st Legion.