This is the United Nations Space Command.

This is the main military branch of the Unified Earth Government http://steamproxy.net/groups/UnifiedEarthGovernment-SE
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Branches


High Command (HIGHCOM)

Administrative
Personnel Command (PERSCOM)
Unified Ground Command (UNICOM)
Special Warfare Command (SPECWARCOM)
Colonial Military Administration
UNSC Astrophysics
UNSC Medical Corps (MEDCORPS)
UNSC Engineering Corps (ENGCORP)
UNSC Test and Evaluation Corps
UNSC Ordnance Committee
UNSC Procurement


Naval Command (NAVCOM)
Fleet Command (FLEETCOM)
Office of Naval Intelligence (ONI) http://steamproxy.net/groups/OfficeofNavalIntelligence-SE
<Classified> Beta-5 Division
SPARTAN-III Program <Classified>
Department of Colonial Security
UNSC Prowler Corps
ONI Security
ONI Signal Corps
Logistical Operations Command (NavLogCom)
Office of Investigations (OI)
Naval Special Warfare (NAVSPECWAR)
ORION Project
SPARTAN-II Program


UNSC Marine Infantry
UNSC Marine Aviation
UNSC Marine Logistics
UNSC Marine Military Police
UNSC Marine Chaplain Corps
UNSC Marine Special Operations
Orbital Drop Shock Troopers


UNSC Army Infantry
UNSC Army Military Police
UNSC Army Logistics


<Classified> >SPARTAN Program

SPARTAN-IV Program <Classified>