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The Aviation Combat Element (ACE) is a Marine Composite Squadron (Reinforced) composed of a Medium/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.

The Logistics Combat Element (LCE) (formerly Combat Service Support Element or CSSE) contains all the logistics specialists and equipment necessary for the unit to support itself for 15 days in an austere expeditionary environment. It includes service support, medical, dental, maintenance, transportation, explosive ordinance disposal, military police, utilities production and distribution, bulk fuels, and other technical experts. It consists of approximately 300 Marines and sailors. This element is occasionally referred to as the MEU Service Support Group (MSSG).

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 is what this area is formerly known as.
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