Fleetmaster

The Fleet Master is a very high-ranking Sangheili within the Covenant Navy. This grade of "Elite" commands Task Forces and small Fleets.

Rank
Whenever a small Fleet is needed for any mission away from the entirety of the Covenant Navy, a Fleet Master will be assigned and given command of several warships for the mission. This shows they could be the Covenant equivalent to a UNSC Rear Admiral. Since Fleet Masters are such a high rank, it is assumed that they may also command the entire Fleet should their Supreme Commander or Imperial Admiral be incapacitated during space combat, though this is still unconfirmed.

They normally operate from a large warship, such as a Reverence-class Cruiser. An example of this can be seen in Halo: Ghosts of Onyx, in which the Fleet Master Voro Nar 'Mantakree operates from the Reverence-class Cruiser Incorruptible.

The Arbiter, should their role ever require it, could probably be assigned the role of Fleet Master. As well, should Councilors decide to get involved in military operations, they too could probably have the authority of rank to command an entire Fleet, even having Zealots subordinate to them.

Physical Appearance
Fleet Masters don't appear to have any changes on their armor from other Elites of the same rank (for example, it is impossible to tell a Zealot Fleet Master apart from a Zealot Field Master based on armor alone). Their armor is Gold/Yellow.

Known Fleet Masters

 * Voro Nar 'Mantakree - Ship Master of the Incorruptible, who led a Fleet to follow the Bloodied Spirit to Onyx.
 * Thel 'Vadam - Current Ship Master of the Assault Carrier Shadow of Intent, Current Fleet Master of the Fleet of Retribution and Arbiter.
 * Rtas 'Vadum - Former Ship Master of the Assault Carrier Shadow of Intent, Former Fleet Master of the Fleet of Retribution and Former Special Operations Commander of the Covenant.
 * Unknown Fleet Master - a Fleet Master in charge of delivering the cryogenically frozen Catherine Elizabeth Halsey to Covenant space.
 * Unnamed Ship Master - Current Ship Master of an unknown Assault Carrier, Current Fleet Master of the Fleet of Righteous Vigilance.

Trivia

 * When Voro 'Mantakree was promoted from Major Domo to a Zealot Fleet Master, an extra part was added to his name, making it Voro Nar 'Mantakree.
 * A Fleet Master may prospectively have more authority than a Field Master, since delivering an army to the battlefield may fall into one of the responsibilities performed by a Fleet Master.