BACKSTAGE BAGHDAD Tour de France champion Lance Armstrong, left, and comedians Robin Williams, center, an Lewis Black share a laugh before their USO show on Camp Victory, Iraq, Dec. 13, 2010. U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, and his wife, Deborah, are hosting a holiday USO tour with Williams, Black, Armstrong, Kathleen Madigan and country artist Kix Brooks in the Central Command area of responsibility. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 271822-Q-ECT37-666.jpg Photo Gallery