U.S. Air Force Senior Airman Keith Nichols, 354th Civil Engineer Squadron engineering technician, Eielson Air Force Base, explains to Republic of Korea (ROK) air force members how to prepare an area for cutting during combined base recovery training at Gimhae Air Base, ROK, April 5, 2018. U.S. and ROK forces held the annual training to improve communications and their ability to operate in a combined environment. (U.S. Air Force photo by Staff Sgt. Franklin R. Ramos)