A U.S. Marine with the 15th Marine Expeditionary Unit’s Maritime Raid Force climbs a caving ladder during maritime interoperability training aboard Camp Pendleton, Calif., Jan. 7, 2015. MIT prepares the MRF for its upcoming deployment by enhancing their combat skills and teaching them techniques for boarding vessels. (U.S. Marine Corps photo by 1st Lt. Allison Burgos/Released)