SPARTANs are statistically the most effective infantry assets available to the UNSC, personally responsible for countless victories against both the Covenant Empire, its remnants, and insurrectionist forces. Conscripts of both the S-II and S-III programs take part in intense combat indoctrination from an early age and receive extensive biological augmentation procedures. The S-II, S-IV, and some S-III personnel were equipped with advanced MJOLNIR powered assault armor to further increase their physical superiority. The SPARTANs exceptional lethality in combat lead some to believe they were actually invincible. Notably, they were feared among the Covenant as demons.
Below are all known SPARTAN squads and companies.
- SPARTAN Program
- SPARTAN-III Program
- SPARTAN-IV Program
Orbital Drop Shock TroopersThe Marines Corps' Orbital Drop Shock Troopers are an important part of any UNSC invasion force. Disciplined and skilled, they drop into the most hostile areas via SOEIVs. They attempt to complete some of the most difficult tasks in hostile areas, such as clearing enemy ground forces or establishing landing zones for incoming Pelicans.
Below are all known ODST units.
- 105th Marine Expeditionary Unit (SOC)
- 105th Drop Jet Platoon
- 340th ODST Combat Training Unit
- Echo Team
- Kilo Team
- 3rd Helljumper Platoon
Force Recon is the UNSC Marine Corps Special Forces contingent focused on reconnaissance and threat assessment.
ONI Security is the personal security division of ONI by Naval Special Warfare Group. They are recruited from the Army and Marines and placed in high priority locations. Their attire is a darkened version of the Marine BDU with heavier armor.
Special Warfare Command / SPECWARCOM
Special Warfare Command (SPECWARCOM) is a special forces branch of the United Nations Space Command, directly subordinate to Unified Ground Command and indirectly to UNSC High Command. SPECWARCOM is the special forces branch for ground forces, which is mainly the UNSC Army. The command consists of various special operations teams that conduct covert operations against both the insurrectionists on UNSC controlled planets and the Covenant. The command also has tactical control of SPARTAN units for specific operations that fall under Unified Ground Command jurisdiction.