PENTAGON WELCOME A sharp military salute from senior military assistant Marine Corps Lt. Gen. John Kelly greets Leon E. Panetta as he arrives at the Pentagon, July 1, 2011, for his first day on the job as the nation's 23rd defense secretary. After arriving, Panetta was sworn in by Defense Department General Counsel Jeh Johnson. Panetta was scheduled to meet with senior staff and have lunch with Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 203436-Y-JCX62-025.jpg Photo Gallery