U.S. Marines and sailors supporting Marine Expeditionary Force Exercise (MEFEX) 2014 struggle with rain and mud to commute to work at 1st Republic of Korea Marine Corps Base, Pohang, Korea, March 13, 2014. MEFEX will enhance the interoperability between the U.S. Marine air-ground task force and ROK Marine task force while holding amphibious capabilities of each nation's Navy and Marine Corps. (U.S. Marine Corps Photo by Cpl. Sara A. Medina, III MEF Combat Camera/Released)