FAREWELL HANDSHAKE Defense Secretary Robert M. Gates shakes hands with President Barack Obama while Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, applauds during the Armed Forces Farewell Tribute to honor the retiring secretary at the Pentagon, June 30, 2011. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 019455-M-RIY46-730.jpg Photo Gallery