Lee Song Ha, a War Memorial of Korea tour guide, explains the dividing line of North and South Korea with 30 U.S. service members who volunteered for the chance to experience the country they’re here to protect during a cultural heritage tour in Seoul, Republic of Korea, March 18, 2017. At the end of World War II, the Japanese colony of Korea was to be freed and united as a single nation. During the transition, American and Soviet soldiers were needed to keep the peace. The dividing line between the American and Soviet zones was the 38th parallel roughly dividing the country in two. (U.S. Air Force photo by Staff Sgt. Benjamin W. Stratton)