Fleet admiral

Fleet Admiral is the highest commissioned officer rank of 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. They 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.