Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey delivers the commencement address at the 2015 graduation of National Defense University's College of International Security Affairs, National War College, Information Resources Management College, and Dwight D. Eisenhower School for National Security and Resource Strategy schools, on Fort Lesley J. McNair, Washington, D.C., June 18, 2015. NDU is dedicated to being the premier national security institution focused on advanced joint education, leader development and scholarship. (DoD Photo by Mass Communication Specialist 1st Class Daniel Hinton/released)