Fleet Command

UNSC Fleet Command, colloquially known as FLEETCOM, is the primary operations group of the United Nations Space Command Navy, responsible for ship deployment, mission structures, and space operations. It is subordinate to the UNSC Naval Command. All naval vessels report through FLEETCOM and the commanding admirals of the UNSC.

Special Operations Command
Fleet Command's Special Operations Command (SPEC-OPCOM) is the parent branch of Naval Special Warfare (NAVSPECWAR), the SPARTANs' service branch.

Headquaters
FLEETCOM has two known headquarters, one on the planet Reach at an undisclosed location, but most likely nearby Menachite Mountain and the Office of Naval Intelligence's CASTLE Base. The second known headquarters is in Sydney, Australia, on Earth.