Gorbavetch Sin-Yon was a Human male member of the Imperial Army's Stormtrooper Corps during the Galactic Civil War. Born on the Confederacy of Independent Systems-held Hudec during the height of the Clone Wars, his father was a member of the Confederacy, and taught him many military tactics, history, and terminology. At the age of 18, he entered the Imperial Academy of Carida. He emerged as a captain in the Empire's 501st Legion, known as "Vader's Fist".

Quickly rising through the ranks, he was stationed on the Death star in 0 BBY, and he manned a turbolaser during the Battle of Yavin after it's operator was knocked unconsious, which he would later recieve a promotion to Commander, but after seeing the Alliance had the upper hand, was one of several officers to evacuate the station before it was destroyed. He later participated in the search for rebels on Kashyyyk during the Blockade of Kashyyyk, and took part in the Battle of Hoth and Battle of Pantora