Dempsey Addresses Audience at USO Show in Afghanistan U.S. Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, addresses the audience at a USO holiday show on Bagram Airfield, Afghanistan, Dec. 8, 2014. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 912901-G-NGD68-935.jpg Photo Gallery