The 31st Marine Expeditionary Unit has arrived in the Middle East, bringing a range of capabilities into theater and giving President Trump more options in the war against Iran. Some of the MEU’s primary missions involve seizing territory, conducting raids and intercepting vessels. A MEU is made up of about 2,200 Marines and sailors that operate out of ships that act as a mobile base. The ships are loaded with aircraft, watercraft, drones and other weapons. The unit is self-sustaining for about two weeks be ...