CHEERS U.S. troops and civilians enjoy the USO holiday tour on Bagram Airfield, Afghanistan, Dec. 15, 2010. U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, and his wife, Deborah, are hosting the tour. SHARE IMAGE: Download Image: Full Size (0.07 MB) Photo By: VIRIN: 106363-Y-JXF99-016.jpg Photo Gallery