151205-N-YZ751-314 NAS SIGONELLA, Sicily (Dec. 5, 2015) Marine Corps Gen. Joseph F. Dunford, Jr., chairman of the Joint Chiefs of Staff, talks to the crowd of service members and their families during the 2015 USO Holiday Tour aboard Naval Air Station (NAS) Sigonella, Dec. 5. Sigonella was the first stop of the 2015 USO Holiday Tour, a multi-day, three-continent trip with the 2015 USO Entertainment Troupe. (U.S. Navy photo by Mass Communication Specialist 1st Class Tony D. Curtis/Released)