Lock " Lock " was the nickname of a clone trooper captain in the Grand Army of the Republic . A veteran of the Battle of Geonosis , he eventually led a clone trooper squad in the Mission to Kynachi , where he perished with the squad ' s freighter . The Republic unit would later become known as " Breakout Squad . " Lock was in charge of a clean - up crew on the planet where the ship " Malevolence " was destroyed . Lock came up with the nicknames Breaker , Sharp , and Chatterbox . Biography . Like all clone troopers , the clone trooper captain nicknamed Lock was born on the Wild Space planet Kamino to serve in the Grand Army of the Republic during the Clone Wars . Mission to the Kaliida Nebula . Shortly after Anakin Skywalker led the successful mission to destroy the " Malevolence " , Captain Lock was assigned to search through the wreckage for any indications of which organization had built the separatist battleship . Lock arrived at the Kalida Nebula in the star destroyer " Demolisher " . He took the clone trooper shinies CT - 8863 , CT - 4012 and CT - 5177 down to the " Malevolence " crash site with a " Nu " - class attack shuttle . During the mission , Lock , feeling it inconvenient for the three troopers to call each other by their number , assigned them with nicknames based on one of their skills . CT - 4012 received the nickname " Sharp " for spotting the insignia of the Free Dac Volunteers Engineering Corps in the wreckage . CT - 8863 received " Breaker " which was short for " circuit breaker " after he had discovered a circuit board with an exotic design . As Captain Lock turned to give CT - 5177 his nickname , a B1 battle droid rose from the wreckage and starting shooting at the clones . CT - 5177 was hit and collapsed while the other clones returned fire . The droid was easily destroyed , but CT - 5177 was badly injured . Lock deemed the mission over and they hurried with their wounded comrade to the shuttle and up to the star destroyer for medical aid . Lock demanded that his brother would live , and would not reveal his new nickname unless he did survive . Mission to Kynachi . They were soon assigned to a new mission to the planet Kynachi where the exotic circuit board had been manufactured . Lock and his troopers along with a recovered CT - 5177 assembled in the Jedi Temple ' s landing bay . He then revealed that the clone ' s nickname was Chatterbox , which was an irony on the clone ' s silent nature . For the mission he was put under the command of Jedi General Ring - Sol Ambase and received 11 clones plus two pilots . They were to travel to Kynachi in secret and was to use an unmarked freighter . Unbeknownst to Lock however was that the shuttle had been sabotaged . As soon as they had exited hyperspace the freighter was attacked by Separatist forces . Lock was in the cockpit of the freighter as the attack started and yelled that droid fighters were incoming . His voice vanished as an explosion rocked the ship . The troopers attempted to abandon ship as more explosions occurred , but the launch systems for the escape pods had been tampered with . As such they had to be launched manually from the freighter . As the first pod was launched , Breaker , Knuckles , Chatterbox and Nuru Kungurama jumped into the second one , but realized someone had to stay behind . Lock had then managed to limp his injured body to the pods . Breaker told the captain to get into the pod while he remained to launch it . After understanding the situation he pushed Breaker into the pod and launched it , with his final words that until he was dead , he was the one to give order . As the escape pod soared towards the planet , the freighter exploded , incinerating Lock and everything aboard . Personality and traits . Lock showed both concern and a wanting for his fellow clones to become more like individuals as he personally wanted to come up with nicknames for the clones . He showed a willing to sacrifice himself for his team , as well as making it clear that he was in charge when he shoved Breaker into the escape pod . Equipment . Captain Lock wore a standard clone armor that was " scuffed and scratched " , with a battered helmet that was decorated with jagged blue markings . Behind the scenes . In the mini - game , " Card Commander " , CC - 4142 is mistakenly credited with Lock ' s last words .