H-Zeta Squadron functioned as a TIE/sa bomber group within the Imperial Navy throughout the Galactic Civil War. This squadron belonged to a fleet that was led by Admiral Harkov. In 3 ABY, when Harkov switched his allegiance to the Alliance to Restore the Republic, the squadron followed suit and also defected. During the Battle of Ottega, it engaged the military of the Galactic Empire, ultimately suffering complete annihilation.