From Halopedia, the Halo wiki
This article is about the rank used in the original Covenant Empire. For the rank used in Jul 'Mdama's Covenant, see Supreme Leader.
Supreme Commander was a rate used in the Covenant military. Within the original Covenant, the rate was given to Fleetmasters explicitly appointed by the Hierarchs to lead major military expeditions.
The title of Supreme Commander was above the authority of Fleetmaster and below the authority of Imperial Admiral. It is roughly equivalent to the UNSC rank of Fleet Admiral, though with considerably more autonomy.
A Supreme Commander is responsible for a fleet or a contingent of fleets and leads blockades, naval battles, or orbital bombardment operations. Supreme Commanders command large Covenant fleets, such as the Fleet of Particular Justice, which was formerly led by Thel 'Vadamee before he was stripped of his rank due to his failure at Installation 04.
In addition to commanding naval forces, Supreme Commanders have authority over the ground troops attached to their fleet. For example, Supreme Commander Thel 'Vadamee ordered part of his fleet's special operations contingent to conduct a mission to the agricultural support ship Infinite Succor during the Battle of Installation 04.
When commanding a fleet, Supreme Commanders sometimes wear purple or gold armor featuring an ornate helmet; at least two Supreme Commanders, Thel 'Vadamee and Rho 'Barutamee, chose to wear a purple-colored cloak as part of their ensemble. In the case of Thel, his doarmir cloak served a purely sentimental purpose, as it reminded him that he could make grave mistakes if he let his guard down. It is unknown if there is a ceremonial significance to these cloaks. These were not permanent additions to their attire, however, as Thel chose not to wear it when he appeared before the High Council.
While commanding the Third Fleet of Glorious Consequence, Supreme Commander Luro 'Taralumee wore armor that resembled that of most Sangheili Zealots, though it was more ornate, possessing prongs similar to those on 'Vadamee's helmet.
List of appearances