UNSC Marine Corps

The UNSC Marine Corps is a military branch of the United Nations Space Command primarily deployed as expeditionary infantry. Characterized by its high mobility, the Marine Corps has been associated with the UNSC Navy since its inception, with most Navy capital ships carrying an embarked Marine force.

Operating Forces
The majority of the UNSC Marine Corps personnel fall under the UNSC Marine Corps Forces Command (MARFORCOM), commanded by the Assistant Commandant of Operations and Planning. Under the UNSC Marine Corps Forces Command, a Marine Corps Air-to-Ground Task Force (MAGTF), assigned to a planet or system, is commanded by a Lieutenant General. The MAGTF commander oversees a Marine Corps infantry and reconnaissance division, a Marine Aviation Wing, and a Marine Logistics Brigade. A MAGTF includes a Command Combat Element (CCE), Ground Combat Element (GCE), Aviation Combat Element (ACE), and Logistics Combat Element (LCE). Under a standard MAGTF, the Lieutenant General commands the Marine Expeditionary Force (MEF), a Brigadier General commands a Marine Expeditionary Brigade, and a colonel commands a Marine Expeditionary Unit (MEU). Under each MEF, there is one MEB and three MEUs. The units are often attached to a UNSC Navy Fleet to support their expeditionary warfare mission.

In conjunction with the Marine Corps Forces Command, there are five major commands subordinate to the Forces Command. Each Sector has its own Fleet Marine Force, Sector designation while the Sol Core has Fleet Marine Force, Sol Core where it oversees the Sol Core. Each FMF is considered the administrative arm of all operational Marine Corps activity within the designated FLEETCOM Sector Area of Operation. A Fleet Marine Force Headquarters can act as a Naval Command Headquarters during galactic-scale operations. The Fleet Marine Forces Commanders are Lieutenant Generals who report to both the designated FLEETCOM Sector Commander and Marine Corps Forces Command.

The UNSC Marine Corps Forces Special Warfare Command (MARFORWARCOM) is the special warfare command for the UNSC Marine Corps. The command was created in 2182, following the integration of many nations into the UNSC. It holds the UNSC Marine Corps Orbital Drop Shock Troops. Commanded by a General, the MARFORWARCOM reports to the Commandant and Assistant Commandant of the Marine Corps. It oversees all Shock Troop Corps, Shock Troop Divisions, and training of all ODSTs. In recent years, the MARFORCWARCOM created their own MAGTF organization including Marine Corps Special Warfare Expeditionary Brigades (SWEB) and Marine Corps Special Warfare Expeditionary Units (SWEU) assigned to a Shock Troop Corps.

Supporting Establishments
The Marine Corps Intelligence Force Command (MARINTFORCOM) is known to oversee all intelligence activities within the UNSC Marine Corps. The Marine Cyberspace Force (MARCYBFOR), Marine Counterintelligence Force (MARCOUNINTFOR), and Marine Cryptologic Support Force (MARCRYFOR). MARINTFORCOM provides Marine Intelligence Regiments (MARINTREM) to MAGTF units in the area with a focus on providing actionable intelligence to the deployed forces. MARINTFORCOM works closely with the UNSC Navy's Office of Naval Intelligence (ONI) in supporting NAVCOM's intelligence collecting efforts.

The Marine Corps Combat Development Command (MARCORCOMDEVCOM), Marine Corps Logistics Command (MARCORLOGCOM), and Marine Corps Systems Command (MARCORSYSCOM) provide warfighting capability research, material, and personnel to support the Marine Corps mission. MARCORLOGCOM works directly with the UNSC Navy Logistics Command as a joint force to support deployed forces. The MARCORCOMDEVCOM provides the Marine Corps with successful research and development teams to help with enhancing doctrine and warfighting opportunities. Notably, they are charged with focusing on future concepts, advanced warfighting techniques, and creating solutions to cutting-edge problems. MARCORSYSCOM holds the Acquisition and Technology arm of the UNSC Marine Corps through various Marine Corps Warfighting Labotories, Program Executive Offices, and other enterprises to support the Marine Corps advancement.

The Marine Corps Forces Security Command (MARCOSECCOM) is the primary Military Police, Embassy Security, Base Security, and Anti-Terrorism Force to provide security within the UNSC Marine Corps. Notably, the Marine Corps Embassy Security Force is charged with the protection of government installations across UNSC Controlled Space.

Marine Reserves
The UNSC Marine Corps Reserve (MARFORRES) is the reserve force of the Marine Corps. It is the primary expeditionary force and works alongside the UNSC Navy Reserves to protect colonies where forces are stationed.

Formations

 * Marine Expeditionary Unit, a large self contained reaction force.
 * Marine Expeditionary Company, meant to be attached to some small warships, namely frigates.
 * Marine Division, the largest possible formation that can be embarked on standard troop ships/carriers.