President Barack Obama, Secretary of Defense Robert M. Gates, and Chairman of the Joint Chiefs of Staff Admiral Mike Mullen salute as troops parade during the Armed Forces Farewell Tribute in honor of Secretary Gates at the Pentagon in Arlington, Va., June 30, 2011.

President Barack Obama, Secretary of Defense Robert M. Gates, and Chairman of the Joint Chiefs of Staff Admiral Mike Mullen salute as troops parade during the Armed Forces Farewell Tribute in honor of Secretary Gates at the Pentagon in Arlington, Va., June 30, 2011.