US Marines with the 11th Marine Expeditionary Unit attach a concrete barrier to a CH-53E Super Stallion during helicopter external load training at Arta Beach, Djibouti. Photo / Marine Corps Marines from an amphibious task force have left their ships in the Middle East and deployed to Syria, establishing an outpost from which they can fire artillery guns in support of the fight to take back the city of Raqqa from Isis.