BOOK SIGNING U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, signs the guest book after touring the Colombian frigate ARC Almirante Padilla in Cartegena, Colombia, June 30, 2010. Mullen visited the South American country to reaffirm the commitment between the two countries in their ongoing war against narco-terrorism. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 289018-T-GUP19-712.jpg Photo Gallery