CC-1119, nicknamed «Appo,» was a clone trooper officer who served as a Clone Sergeant and later as a Clone Commander in the 501st Legion during the Clone Wars. As a soldier in military service to the Galactic Republic, Appo participated in several major battles fought between the Grand Army of the Republic and the droid armies of the Confederacy of Independent Systems—from Umbara at the height of the galactic conflict, to the Republic capital world of Coruscant by the war’s end. He was a loyal trooper who obeyed the orders of his commanding officer, conditioned to render unquestioned allegiance to the Republic.

As with all troopers in the Grand Army, Appo was cloned on the extragalactic world of Kamino, where Kaminoan scientists used the genetic template of Jango Fett, a human bounty hunter, to create a clone army for the Republic. Before Appo’s promotion to the military rank of Commander, he served as a Clone Sergeant in the 501st Legion, led by Jedi General Anakin Skywalker and CT-7567 Clone Captain «Rex.» During the Battle of Umbara, command of the 501st was temporarily transferred to another Jedi officer, General Pong Krell, as a result of Skywalker returning to Coruscant at the request of Supreme Chancellor Sheev Palpatine. Sergeant Appo witnessed firsthand Krell’s willingness to sacrifice his troops but nonetheless faithfully executed the general’s orders.

In the final days of the war Chancellor Palpatine had put Order 66 into effect, declaring that all Jedi were enemies of the Republic. As a result, Appo, serving as the commander of the force of the 501st active on Coruscant, accompanied the Sith Lord Darth Vader as the 501st participated in the Siege of the Jedi Temple, invading the Jedi Order‘s home on Coruscant as part of a systematic purge that occurred across the galaxy. He encountered Senator Bail Organa during the attack, and used the threat of force to keep the Alderaanian politician at bay. But as Organa tried to leave, Padawan Zett Jukassa ambushed Appo’s squad, striking down the commander and several of his troops.