Marine expeditionary unit
A Marine Expeditionary Unit (MEU, pronounced Myuu), formerly called Marine Amphibious Unit (MAU), is the smallest Marine air-ground task force (MAGTF) in the United States Fleet Marine Force. Each MEU is an expeditionary quick reaction force, deployed and ready for immediate response to any crisis.
A Marine Expeditionary Unit is normally built around the building blocks of a MAGTF: a reinforced Marine infantry battalion is the ground combat element, the aviation combat element is a composite helicopter squadron, a battalion-sized logistics combat element, and a command element. Troop strength is about 2,200 and usually commanded by a colonel, and is deployed from an amphibious assault ship. Currently a Marine expeditionary unit embarks marines and equipment onto the amphibious warfare ships of an Expeditionary Strike Group which also includes escort ships and submarines to protect them from air, surface, and submarine threats, for further protection and strong air support this is often along with one or more carrier battle groups.
The MEU is unique in that its air and ground combat elements are combined with a logistics combat element under one commander; other services do not unite the command of air and ground forces until much higher command levels.
When the United States Army integrates with Air Force assets, it typically is at the theater or corps level, with a general commanding, while at the division level it will integrate with Army aviation, which can be organized as organic at the battalion level.
The MEU's ground combat element also combines artillery, light armor and tanks at a much lower level than was common in the Army until the development of the brigade combat team early in the War on Terror, with a similar concept, the combat command, being utilized in World War II.
This air-ground task force concept is designed to thoroughly exploit the combat power inherent in air and ground assets by closely integrating them into a single force. The MEU brings all the supplies and logistical support it needs to sustain itself for quick mission accomplishment or to pave the way for any follow-up forces. This self-sustainment allows more flexibility in disposition and operations of forces, and allows the MEU to initiate operations sooner and let support catch up later, without having to wait for external logistical support to begin a mission. Deployments on U.S. Navy amphibious assault ships allows MEUs to seabase around the globe, ready for deployment at short notice.
A typical MEU has approximately 2,200 Marines and sailors. It is equipped with:
Many types of equipment are, or will soon, undergo a transitory phase as they are replaced. Some examples include the MV-22 Osprey replacing the CH-46, the Marine Personnel Carrier replacing the LAV-25, the F-35 Lightning II replacing the AV-8B Harrier, the Ch-53K Super Stallion replacing the CH-53, and the H-1 upgrade program (where the AH-1Z Viper and UH-1Y Venom replace the AH-1W and UH-1N).
 Ground Combat Element
The ground combat element (GCE) is based on the battalion landing team (BLT), an infantry battalion reinforced with an artillery battery, amphibious assault vehicle platoon, combat engineer platoon, light armored reconnaissance company, tank platoon, reconnaissance platoon, and other units as the mission and circumstances require. The total strength is approximately 1,100 members.
The reconnaissance platoon provides the basic element for the Maritime Special Purpose Force. This force consists of four elements. The assault platoon (a direct action platoon augmented from Force Recon), security (a selected infantry platoon from the battalion landing team), reconnaissance and surveillance assets, and a headquarters section. The total strength is approximately 350 Marines and sailors.
 Aviation Combat Element
The aviation combat element (ACE) is a Marine composite squadron (reinforced) composed of a medium or heavy helicopter squadron augmented with three other types of helicopters, one detachment of amphibious flight-deck-capable jets, and a Marine air control group detachment with air traffic control, direct air support, and anti-aircraft assets.
 Logistics Combat Element
The logistics combat element (LCE) (formerly combat service support element or CSSE) is based on the MEU combat logistics battalion (CLB) (formerly MEU service support group or MSSG). It contains all the logistics specialists and equipment necessary for the MEU to support and sustain itself for up to 30 days in an austere expeditionary environment. It includes service support (postal and disbursing), medical, dental, intermediate maintenance, intermediate supply (consumables and secondary reparables), transportation (distribution and landing support), explosive ordnance disposal, military police, utilities production and distribution, bulk fuels, internal communications, and various other technical experts. It consists of approximately 300 Marines and Sailors.
 Command Element
The command element (CE), which includes the MEU commander and his supporting staff, provides command and control over the other three elements. It includes specialized detachments for naval gunfire, reconnaissance, surveillance, specialized communications, radio reconnaissance (SIGINT), electronic warfare, intelligence and counterintelligence, and public affairs missions. The overall strength is about 200 Marines and sailors.
 Expeditionary Strike Group
Recently, MEUs have been deployed within an expeditionary strike group (ESG) in the Mediterranean, the Western Pacific, and periodically, the Atlantic and Indian Oceans. An ESG is typically composed of three amphibious ships that embark the necessary troops and equipment and are escorted by a guided missile cruiser (CG) and guided missile destroyers (DDG) and submarine (SSN) support.
Before the ESG, MEUs were typically deployed as part of an amphibious readiness group Amphibious ready group
 The MEU Cycle
MEUs maintain their subordinate elements in fifteen month cycles: a nine months stateside (with six set aside for training), and a six month deployment aboard ship. These cycles ensure that at least two of the seven MEUs are deployed forward at any given time.
Interim or buildup period: Upon completion of a deployment, the Marine expeditionary unit remains "special operations capable" for approximately one month, prepared to respond to events around the world. The MEU then releases its major subordinate elements (MSEs), retaining only its command element. This period provides the command element a chance to rotate select personnel and begin planning for the addition of newly assigned MSEs and “work-up” training. When the MSEs are received, the MEU begins six months of intense pre-deployment training.
Work-up period: Training during the six-month work-up period is often referred to as "crawl, walk, run". The Marines and Sailors progress through curriculum and exercises that teach individual, small unit, and unit tactics while integrating the separate MEU elements into a cohesive, flexible, and powerful force. The work-up period includes training in many combat and noncombat skills, to include:
- urban sniper
- mechanized and motorized raids
- non-combatant evacuation operations
- humanitarian assistance
- mass casualty
- scout swimmer
- jungle and/or mountain warfare
- riot control.
Exercises conducted during the work-up period can include:
- Amphibious squadron—MEU integration training (PMINT)
- Realistic urban training exercise (RUT), formerly training in an urban environment exercise (TRUEX)
- Expeditionary strike group exercise (ESGEX)
- Special operations capable certification exercise (CERTEX or SOCCEX); prior to deployment, the MEU receives certification as special operations capable and then referred to as a "MEU (SOC)". There is very little within the capability of a MEU (SOC) that meets the level of special operations practiced by United States Special Operations Command, but instead refers to the ability of the MEU to perform missions outside that of the traditional missions of its component units.
Deployment: Following the work-up period, the MEU deploys for six months in support of geographic combatant commanders. During this time, the MEU is a forward-deployed, self-sustaining force that combatant commanders can direct to accomplish a variety of special operations and conventional missions.
The missions may include:
- Conventional operations (amphibious assaults and raids)
- Tactical recovery of aircraft and personnel (TRAP)
- Humanitarian assistance operations (HAO)
- Noncombatant evacuation operations (NEO)
- Security operations.
 List of MEUs
 West Coast MEUs
 East Coast MEUs
 Japan MEU
 See also
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