Chairman of the Joint Chiefs of Staff Adm. Mike Mullen, U.S. Navy, and his wife Deborah enjoy the USO Holiday Tour at Bagram Air Field, Afghanistan, on Dec.15, 2010. The Mullens are hosting the holiday tour featuring comedians Robin Williams, Lewis Black and Kathleen Madigan, Tour de France champion Lance Armstrong and country musicians Kix Brooks and Bob Dipiero touring the Central Command area of responsibility.