Comedian Robin Williams signs autographs during the second stop of the 2007 USO holiday tour on Camp Arifjan, Kuwait, Dec. 17, 2007. U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, hosted the tour to thank deployed troops for their sacrifice and service. Comedian Robin Williams signs autographs during the second stop of the 2007 USO holiday tour on Camp Arifjan, Kuwait, Dec. 17, 2007. U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, hosted the tour to thank deployed troops for their sacrifice and service. SHARE: Download: Full Size (5.67 MB) Tags: Photo Essays Credit: VIRIN: 292222-L-XPH52-537.jpg Photo Gallery