Gen. David H. Petraeus (C) accompanied by his family, Deputy Secretary of Defense William J. Lynn, and Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, salutes during a pass and review of troops at the armed forces farewell tribute and retirement ceremony in honor of Gen. Petraeus at Summerall Field on Joint Base Myer-Henderson Hall, Virginia on August 31, 2011. UPI/Jacob N. Bailey/US AIR FORCE