Camp Pendleton residents, friends and employees gather for the grand opening of the Marine Corps' newest Marine Corps Exchange in 20 area, May 3. The new MCX facility will provide convenient, one-stop services and sales to service members, dependants and retired veterans. - Camp Pendleton residents, friends and employees gather for the grand opening of the Marine Corps' newest Marine Corps Exchange in 20 area, May 3. The new MCX facility will provide convenient, one-stop services and sales to service members, dependants and retired veterans.