Fleet Admiral is the highest commissioned officer rank in the UNSC Navy, although promotion to this rank is restricted to times of war. It is equal in rank to General of the Air Force in the UNSC Air Force, and General of the Army in the UNSC Army. Fleet admirals are generally well experienced and battle-hardened naval commanders.

As there is no equivalent in the UNSC Marine Corps, fleet admirals outrank all United Nations Space Command military organizations' Marine Officers.


  1. Fleet Admiral Terrence Hood is in charge of all Earth's defenses and Fleet Admiral Harper is in command of one of the fleets making up those defenses.