Combat support

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In the United States Army, the term combat support refers to units that provide fire support and operational assistance to combat elements. Combat support units provide specialized support functions to combat units in the areas of chemical warfare, combat engineering, intelligence, security, and communications.

Combat support should not be confused with combat service support, which are units which primarily provide logistical support by providing supply, maintenance, transportation, health services, and other services required by the soldiers of combat units to continue their missions in combat. Expressed another way, Combat Support units are focused on providing operational support to combat units, while Combat Service Support units are focused on providing logistical support to combat units. Actual combat units are collectively referred to as combat arms units; hence, all army units fall into the category of either combat arms, combat support, or combat service support.

Within the U.S. Army, the combat support branches are the:

Combat Support Branch Insignia

United States Marine Corps doctrine designates all Ground Combat Element (GCE) forces, other than infantry, including field artillery, assault amphibian, combat engineer, light armored reconnaissance, reconnaissance, and tank as combat support. The primary mission of all USMC combat support units is to directly support the infantry.

The Marine Corps does not have a separate "Chemical Corps" but rather mans each GCE battalion with NBC specialist personnel (officer and enlisted) in the battalion operations section. The Marine Corps also maintains a battalion-sized Chemical Biological Incident Response Force (CBIRF) as an element of the II Marine Expeditionary Force (II MEF), responsible for fulfilling the mission of Chemical, Biological, Radiological, Nuclear, and High-Yield Explosive (CBRNE) consequence management.

USMC military intelligence (intelligence battalions), military police (law enforcement battalions), and signal (communications battalions), as well as radio battalions (signals intelligence and electronic warfare), air naval gunfire liaison, force reconnaissance, psychological operations, civil affairs, and public affairs units are designated as Command Element (CE) (C4ISTAREW) units and are classed separately from GCE combat support units.

All Marine aviation aircraft squadrons and aviation support units (aviation command, control, communications, unmanned aerial vehicle, aviation logistics, and aviation ground support squadrons, as well as low altitude air defense battalions) are organic to the Aviation Combat Element (ACE). In the Marine Corps, the Army Aviation combat support missions of battlefield reconnaissance, signals intelligence, and assault helicopter support are performed by the ACE though the Marine Aviation functions of aerial reconnaissance, electronic warfare, and assault support. The remaining three functions of Marine Aviation are: offensive air support, antiair warfare, and control of aircraft and missiles.

Combat Service Support, known in the Marine Corps as the Logistics Combat Element (LCE), is responsible for providing direct logistical support to GCE units and general support throughout the MAGTF. Combat Logistics Battalions provide motor transport, supply distribution, and landing support (i.e., materiel handling) directly to dedicated GCE units. Supply, maintenance, engineer support, medical, and dental battalions provide general support throughout the MAGTF.

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