Congratulatory Handshake President Barack Obama shakes hands with Army Gen. Martin E. Dempsey, incoming chairman of the Joint Chiefs of Staff, at the change-of-responsibility ceremony on Joint Base Myer-Henderson Hall, Va., Sept. 30, 2011. Navy Adm. Mike Mullen, outgoing chairman, retired after 43 years of service. DoD photo by U.S. Navy Petty Officer 1st Class Chad J. McNeeley SHARE: Download: Full Size (0.33 MB) Tags: Chairman, Dempsey, change of responsibility, Obama, Joint Chiefs, All images Credit: U.S. Navy Petty Officer 1st Class Chad J. McNeeley VIRIN: 110930-N-TT977-036.JPG Photo Gallery