U.S. Marine Corps Gen. Joseph F. Dunford, Jr., chairman of the Joint Chiefs of Staff (CJCS), eats dinner with service members Dec. 5, 2016 at Incirlik Air Base, Turkey. Dunford is the 19th CJCS, the nation’s highest-ranking military officer, and the principal military advisor to the President, Secretary of Defense, and National Security Council. (U.S. Air Force photo by Airman 1st Class Devin M. Rumbaugh)