Adm. Mike Mullen (left), chairman of the Joint Chiefs of Staff, stands with (from second from left) U.S. Army Gen. David H. Petraeus; Holly Petraeus (partially hidden), the general's wife; and 2nd Lt. Stephen Petraeus, Gen. and Mrs. Petraeus' son, during an armed forces farewell tribute and retirement ceremony for the general on Wednesday, Aug. 31, 2011, at Joint Base Myer-Henderson Hall in Arlington. (AP Photo/Susan Walsh)

Photo by: Susan Walsh

Adm. Mike Mullen (left), chairman of the Joint Chiefs of Staff, stands with (from second from left) U.S. Army Gen. David H. Petraeus; Holly Petraeus (partially hidden), the general's wife; and 2nd Lt. Stephen Petraeus, Gen. and Mrs. Petraeus' son, during an armed forces farewell tribute and retirement ceremony for the general on Wednesday, Aug. 31, 2011, at Joint Base Myer-Henderson Hall in Arlington. (AP Photo/Susan Walsh)