ARRIVAL IN BULGARIA U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, salutes a Bulgarian officer after stepping off a C-32 in Sofia, Bulgaria, Sept. 13, 2008. Mullen traveled to Bulgaria to meet with senior counterparts at a NATO conference. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 852911-Z-DAP94-000.jpg Photo Gallery