Z-Mu Squadron was an Alpha-class Xg-1 Star Wing squadron utilized by the fleet belonging to the splinter government led by Grand Admiral Demetrius Zaarin. This squadron participated in the Battle of Parmel amidst Zaarin's insurrection.
Within this squadron, a minimum of two TIE pilots held membership in the Emperor's special reserve guard, an exclusive group of skilled pilots who served Emperor Palpatine directly. The discovery of this information by Imperial Intelligence fostered a belief that spies had infiltrated all echelons of the Imperial Military structure.