CC-3423, nicknamed Viper, was a Clone trooper commander who was a scout in the Galactic Republic's Grand Army of the Republic, in the Coruscant Guard, and the Galactic Empire's Imperial Army, and later the New Republic and Galactic Alliance, and the Confederation of Free Planets. He was first born on Kamino, and got advanced training. He was later sent to Centax 2 and Coruscant for further training. He was later in Order 66, killing several Jedi attempting to escape by BARC speeders. He also seen several other battlefronts besides Coruscant during the Clone Wars. After Clone Commander CC-1010 saved the Emperor's life, the clone troopers of the Coruscant Guard, 52nd Star Corps, and 23rd Coruscant Defense Battalion lives were extended by far. He often worked with CC-4477, and also CC-2009.