President Barack Obama at the “Change of Office” Ceremony

President Barack Obama, second from right, participates in the Armed Forces farewell tribute to Chairman of the Joint Chiefs of Staff Admiral Mike Mullen, right, at the “Change of Office” Chairman of the Joint Chiefs of Staff swearing-in ceremony for Gen. Martin Dempsey, left, at Joint Base Myer-Henderson Hall in Arlington, Va., Sept. 30, 2011. Also taking part in the ceremony were Defense Secretary Leon Panetta, second from right, and Vice President Joe Biden, center.