In this image released by the U.S. Department of Defense and taken Monday, Aug. 20, 2012, Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, prepares to board a CH-47 a

 

              In this image released by the U.S. Department of Defense and taken Monday, Aug. 20, 2012, Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, prepares to board a CH-47 a
In this image released by the U.S. Department of Defense and taken Monday, Aug. 20, 2012, Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, prepares to board a CH-47 at Kabul International Airport in Kabul, Afghanistan. (AP Photo/D. Myles Cullen, Department of Defense)