Article Photos: Afghan suicide bomber kills US soldier, 2 Afghans

U.S. Defense Secretary Leon Panetta, left, shakes hands with Afghanistan President Hamid Karzai, right, during their joint press conference at the Presidential Palace in Kabul, Afghanistan, Thursday, Dec. 13, 2012. (AP Photo/Susan Walsh, Pool)

U.S. Defense Secretary Leon Panetta, left, shakes hands with Afghanistan President Hamid Karzai, right, during their joint press conference at the Presidential Palace in Kabul, Afghanistan, Thursday, Dec. 13, 2012. (AP Photo/Susan Walsh, Pool)