Vice Admiral

Vice Admiral was a junior flag officer rank used in many navies throughout.

Galactic Empire
In the Imperial Navy, a Vice Admiral was an intermediate rank between Rear Admiral and Admiral. It held no official level of naval force in the Imperial Order of Battle, and thus had a varying command. A Vice Admiral could either substitute for a Commodore in command of a squadron, or in rare cases command a Systems Force in place of a full Admiral. A Vice Admiral could also command an Imperial task force.

New Republic
In the New Republic Starfleet, a Vice Admiral typically acted as either a second-in-command of a battle group or commanded an independent task force. Some also served on Starfleet Command as staff officers.