USO Tour Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, and Army Command Sgt. Maj. John W. Troxell, left, speak to soldiers from the 3rd and 4th Brigade, 10th Mountain Division before the USO Holiday Tour at Qayyarah West Airfield, Iraq, Dec. 25, 2017. Dunford and Troxell, along with USO entertainers, visited service members who were deployed during the holidays. DoD photo by Navy Petty Officer 1st Class Dominique A. Pineiro SHARE: Download: Full Size (0.74 MB) Credit: Dominique A. Pineiro VIRIN: 171225-D-PB383-037C.JPG Photo Gallery