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Lord Vader held several different military and paramilitary titles within the Imperial hierarchy, including that of Supreme Commander.
1.5 Imperial Space after the Pellaeon–Gavrisom Treaty. 1.3 Reorganization after the final death of Palpatine. During the Imperial Civil War, warlords claimed the title of Supreme Commander. Lord Vader occupied a personal role as Palpatine's lieutenant, with several titles and offices including Dark Lord of the Sith and warlord the specific title of Supreme Commander became more prominent in the post-Endor Empire as a position of great power, until in the era of the Imperial Remnant some nineteen years after the Battle of Yavin, the Supreme Fleet Commander assumed the duties and responsibilities of head of state of Imperial Space. In fact, specific references had Vader and Skywalker as "Supreme Commander of the Imperial Forces" and Admiral Pellaeon rather as "Supreme Commander of the Imperial Fleet" or "Supreme Fleet Commander" but all three men's ranks were sometimes abbreviated to "Supreme Commander". Although technically the Emperor, as the Head of State, Head of Government and the Commander in Chief, held absolute authority over the Imperial forces, the Supreme Commander held direct command over the segments of the Imperial Military. The title of Supreme Commander, also Supreme Commander of the Imperial Forces, Supreme Commander of the Imperial Fleet, Supreme Fleet Commander, or Supreme Commander of the Imperial Military, was borne in succession by several of the most senior officers in the Imperial Military of the Galactic Empire, including Darth Vader before the Battle of Endor, Luke Skywalker during the resurrection of Emperor Palpatine, and later by Grand Admiral Gilad Pellaeon.