The MEU is composed of four basic elements:

Command Element - Serves as the headquarters for the entire unit and allows a single command to exercise control over all ground, aviation, and combat service support forces.

Ground Combat Element - Provides the MEU with its main combat punch.  Built around a Marine infantry battalion, the GCE is reinforced with tanks, artillery, amphibious vehicles, engineers, and reconnaissance assets.

Aviation Combat Element - The ACE consists of a composite medium helicopter squadron containing transport helicopters of various models and capabilities, attack helicopters and jets, air defense teams, and all necessary ground support assets.

Logistics Combat Element - Providing the MEU with mission-essential support such as medical/dental assistance, motor transport, supply, equipment maintenance, and landing is the mission of the LCE.

The MEU consists of approximately 2,200 Marines and Sailors embarked aboard several amphibious ships.  Prior to deployment, the men and women of the MEU undergo a rigorous 26-week training program designed to prepare them for any eventuality.