PANETTA, DEMPSEY ARRIVAL Defense Secretary Leon E. Panetta and Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, arrive at the Air Force transition ceremonies, where Air Force Gen. Mark A. Welsh III succeeded Air Force Chief of Staff Gen. Norton A. Schwartz as the 20th chief of staff on Joint Base Andrews, Md., Aug.10, 2012. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 590459-G-NZI54-492.jpg Photo Gallery