200124-M-SK635-1074 CAMP PENDLETON, Calif. (Jan. 24, 2020) U.S. Marines with 2nd Battalion, 1st Marine Regiment, 1st Marine Division, run up a hill for a simulated amphibious landing during Exercise Iron Fist 2020 on Marine Corps Base Camp Pendleton, California, Jan. 24, 2020. Iron Fist is an annual, bilateral training exercise between U.S. and Japanese forces that builds their combined ability to conduct amphibious and land-based contingency operations. (U.S. Marine Corps photo by Cpl. Cutler Brice/Released)