Former Chairman of the Joint Chiefs of Staff General Joseph F. Dunford, Jr., meets with U.S. Army General John W. Nicholson, Jr., former commander of NATO-led Resolute Support Mission and U.S. Forces–Afghanistan, while visiting Train Advise Assist Command–North, in Mazar-i-Sharif, March 20, 2018 (DOD/Dominique A. Pineiro)