(Left) Seventh Air Force First Sergeant Master Sgt. Cynthia Schmitz was one of 18 Air Force participants in the "2015 Mangudai Warrior Challenge," a 58-hour event that paired U.S. senior enlisted leaders from each military branch with their Republic of Korea counterparts to accomplish different tasks through a range of scenarios while operating on limited food and sleep. The United States Forces Korea event held May 13-15, 2015, is in its second year. (U.S. Army photo by Staff Sgt. Mark A. Kauffman)