Lance Cpl. Paul J. Yi, chemical, biological, radiological and nuclear defense specialist with 4th Light Armored Reconnaissance Battalion, 4th Marine Division, arm wrestles Cpl. Min Wook Yoo, an infantryman with 5th Company, 2nd Battalion, 7th Regiment, 1st Marine Division, at warrior day during Peninsula Express 15 in Pohang, Republic of Korea, July 8, 2015. Both Yi and Woo served as interpreters for the exercise. Peninsula Express is this year’s eighth iteration of the Korean-Marine Exchange Program, a series of exercises between the U.S. and Republic of Korea Marine Corps designed to build interoperability and tactical familiarity between the partner nations. (U.S. Marine Corps photo by Cpl. Ian Leones)