Major Voss served as a Human male Imperial officer. During the Galactic Civil War, he was in command of a Star Destroyer. In the year 3 ABY, the Star Destroyer under Voss's command became part of Admiral Mils Giel's so-called "secret armada". This armada had the mission of transporting the unusual and scarce teezl to the Imperial capital. While they were on their way, a small Rebel squadron, cleverly disguised using TIE fighters, launched an assault. Caught off-guard, Voss instructed his crew to open fire without discrimination, causing widespread destruction within the armada.