** FILE ** U.S. soldiers stand guard at the scene of a suicide attack in Kabul, Afghanistan, Wednesday, Feb. 27, 2013. (AP Photo/Musadeq Sadeq)

Photo by: Musadeq Sadeq

** FILE ** U.S. soldiers stand guard at the scene of a suicide attack in Kabul, Afghanistan, Wednesday, Feb. 27, 2013. (AP Photo/Musadeq Sadeq)