Capstone Course Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, speaks to Capstone 2018-3 students and their spouses at National Defense University at Fort Lesley J. McNair in Washington, D.C., May 18, 2018. Capstone is a five-week course for general and flag officers that reinforces comprehension of joint matters and national security strategy. DoD photo by Army Sgt. James K. McCann SHARE: Download: Full Size (1.02 MB) Credit: Sgt. James K. McCann VIRIN: 180518-D-SW162-1070C.JPG Photo Gallery