TOUR DE FORCE Comedian Robin Williams performs during 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 featuring Williams and comedians Lewis Black and Kathleen Madigan, Tour de France champion Lance Armstrong, and country musicians Kix Brooks and Bob Dipiero in the Central Command area of responsibility. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 939595-J-JXY04-658.jpg Photo Gallery