MAJOR BREAKING: The Pentagon is moving a Marine expeditionary unit to the Middle East, according to two U.S. officials A Marine Expeditionary Unit is a rapid-response force of about 2,200–2,500 Marines and sailors. It usually travels with a group of Navy amphibious ships and includes: - Infantry Marines - Helicopters and sometimes F-35B jets - Osprey transport aircraft - Tanks/light armored vehicles - Artillery and drones - Special operations-style teams