Yuun was a male breathing Gand who served the Galactic Republic as a technical engineer during the Cold War with the Sith Empire. Like many of his species, he referred to himself simply as Gand when he was ashamed. Recruited into Havoc Squad on Hoth at the beginning of the Galactic War, Sergeant Yuun served in the unit until his commanding officer disappeared in 3637 BBY; Yuun spent a year unsuccessfully searching the Unknown Regions for his commander before he left the Republic Military and began studying the technology of the Eternal Empire.