Chairman of the Joint Chiefs of Staff Army Gen. Martin E. Dempsey speaks during a USO Holiday Troop Visit at Royal Air Force Mildenhall, England, Dec. 10, 2014. The visit was part of a USO tradition to partner with senior leaders and celebrity entertainers to visit troops serving abroad during the holidays. (U.S. Air Force photo by Senior Airman Erin O’Shea/Released)