Sanos was a Human male major in the Imperial Military of the reconstituted Sith Empire during the Galactic War against the Galactic Republic. In 3640 BBY, after his third year at the Trench, he was assigned to Corellia under Sith Lord Razer and participated in the Battle of Corellia offensives such as an assault on the Aegis Base together with Major Nedecca and former Intelligence Agent Cipher Nine.