Country music artist Kellie Pickler, retired Chicago Bears middle linebacker Brian Urlacher, actress Dianna Agron, comedian Rob Riggle, actress Meghan Markle, Washington Nationals pitcher Doug Fister pose for a photograph with U.S. Military service members at Bagram Airfield, Afghanistan Dec. 9. The celebrities were in Afghanistan with Gen. Martin E. Dempsey, Chairman of the Joint Chiefs of Staff as part of the USO Holiday Troop Tour. (U.S. Army Photo by Sgt. Adam Erlewein, 4RSSB Public Affairs.)(Released)