US Marine Gen. Joseph F. Dunford Jr., chairman of the Joint Chiefs of Staff, brief to a US Air Force HH-60 Helicopter crew is reflected in a aircrew members visor in Camp Lemonnier, Djibouti on Dec 6, 2015. Dunford is joined with USO entertainers as they travel to various locations to visit service members who are deployed from home during the holidays. (DoD photo by D. Myles Cullen/Released)