Joint Chiefs Chair Adm. Mullen hands over reigns to Gen. Dempsey in Virginia

T-34 aircraft fly in formation during the Chairman of the Joint Chiefs of Staff Farewell Review and Change of Responsibility Ceremony at Joint Base Myer-Henderson Hall's Summerall Field in Arlington, Virginia, on September 30, 2011. Navy Adm. Mike Mullen, 17th chairman, Joint Chiefs of Staff, transitioned responsibility to Army Gen. Martin E. Dempsey. UPI/Roger L. Wollenberg