A National Defense University student takes notes during

A National Defense University student takes notes during a lecture from Marine Gen. Joseph F. Dunford Jr., chairman of the Joint Chiefs of Staff, on Fort Lesley J. McNair, Washington, D.C., Aug. 23rd 2016. NDU provides Joint Professional Military Education to leaders of the U.S. Armed Forces and select others, which prepares students to think and operate effectively at the highest levels in an international security environment. (DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro)