U.S. Defense Secretary Leon E. Panetta (center) shakes hands with his Afghan counterpart, Abdul Rahim Wardak, on Thursday, March 15, 2012, in Kabul, Afghanistan. (AP Photo/Mohammad Ismail, Pool)

Photo by: Mohammad Ismail

U.S. Defense Secretary Leon E. Panetta (center) shakes hands with his Afghan counterpart, Abdul Rahim Wardak, on Thursday, March 15, 2012, in Kabul, Afghanistan. (AP Photo/Mohammad Ismail, Pool)