CT - 19 - 7409 CT - 19 - 7409 , nicknamed " O ' Niner , " was a clone trooper sergeant who served in the Grand Army of the Republic during the Clone Wars . In 22 BBY , he participated in the war ' s opening battle as well as the Battle of the Celestial Wake , and was later stationed at a listening post in the Rishi system that served as a lookout for impending Confederate attacks on nearby systems . When the station came under attack by Confederate battle droids , O ' Niner ordered for a message to be sent to warn the Republic fleet . The droids , however , were jamming the station ' s signal , and O ' Niner was killed defending the post . Biography . The clone trooper sergeant CT - 19 - 7409 , nicknamed " O ' Niner , " was born and raised on the remote planet of Kamino . He served in the Grand Army of the Republic during the Clone Wars and , in 22 BBY , participated in the opening battle of the war on Geonosis , as well as the Battle of the Celestial Wake , and he was later assigned to Rishi Station , a listening post on the moon of the planet Rishi . The outpost acted as an outer defense against the Confederacy of Independent Systems , as well as a lookout post to warn nearby systems of attacking Confederate forces . O ' Niner commanded the other clone troopers stationed there , most of whom were " shinies " — new and inexperienced troopers whose armor was unscathed and shiny . During the war ' s first year , a group of Confederate BX - series droid commandos attacked the station , taking the clones by surprise . O ' Niner ordered for a message to be dispatched to the Republic fleet to warn them of the advancing Confederate forces , but the droids jammed their signal , preventing any messages from being transmitted . O ' Niner was quickly killed by enemy fire , and the droids took the station , leaving only four troopers — Fives , Echo , Cutup , and Hevy — alive to warn the fleet of the impending Confederate attack . With the help of Commander CC - 2224 and Captain CT - 7567 — nicknamed Cody and Rex , respectively — who were coming to inspect the listening post , the clones managed to warn the fleet , and the Confederate attack was prevented . Personality and traits . Sergeant O ' Niner was completely loyal to the Republic , and his first concern was for its safety and that of the other clones , especially those back on Kamino . He also understood the importance of the Rishi outpost , even though many of the other troopers believed that it lacked action and excitement . His body was scarred from battles that he had served in during the war , and his brow even became furrowed from the stress of war . Niner stood 1 . 83 meters tall and had tan skin , brown eyes as well as black hair , which was greying at the time of his death . The sergeant was trained in combat , recon , military tactics and leadership . Equipment . On the Rishi moon , O ' Niner wore white Phase I clone trooper armor which was dirty and damaged from many battles . In battle , the clone used a DC - 15S and a DC - 15 blaster pistol . Behind the scenes . O ' Niner made his only appearance in " Rookies , " the fifth episode in of . He was voiced in the episode by Dee Bradley Baker , who voices all of the clone troopers in the television series . O ' Niner ' s clone designation was revealed in the 2009 " " sourcebook .