The rank was first used in the Galactic Republic. The Fleet Admirals were possibly part of the Admiralty. Within the Imperial Navy, the title of Fleet Admiral was accorded to the commanding officer of a major fleet within a Sector Fleet. A Fleet Admiral answered directly to the High Admiral in charge of Navy operations within their Sector, who was normally the Moff or Grand Moff of the sector; his own command might be a front-line Superiority fleet, an Assault fleet or Bombard fleet for planetary suppression operations, or a logistical Deepdock fleet or Support fleet. The commanding officer of Death Squadron under Darth Vader was also a Fleet Admiral, such as Kendal Ozzel and Firmus Piett.