U.S. Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, speaks to U.S. Air Force Academy cadets at the at the academy's Arnold Hall in Colorado Springs, Colo., Nov. 1, 2013. Dempsey also attended the Air Force’s annual conference for Coordinating Research on the North Atlantic, also known as Corona, during his two-day visit to Colorado. (DOD photo by U.S. Navy Petty Officer 1st Class Daniel Hinton/Released)