U.S. Army Gen. Martin E. Dempsey, left, chairman of the Joint Chiefs of Staff, and his South Korean counterpart, Adm. Choi Yun-hee, salute during an honor ceremony at the South Korean Joint Chiefs of Staff headquarters in Seoul, South Korea, March 27, 2015. Dempsey is visiting Seoul as part of a two-day trip to reinforce the U.S.-South Korean alliance.