Defense Secretary Chuck Hagel prepares to step aboard a C-17 military aircraft en route to Kabul, Afghanistan, after greeting U.S. troops stationed at Manas Air Force Base in Kyrgyzstan, Friday, March 8, 2013. Hagel arrived in Afghanistan Friday for his first visit as Pentagon chief, saying that there are plenty of challenges ahead as NATO hands over the country's security to the Afghans. (AP Photo/Jason Reed, Pool)

Associated Press
Defense Secretary Chuck Hagel prepares to step aboard a C-17 military aircraft en route to Kabul, Afghanistan, after greeting U.S. troops stationed at Manas Air Force Base in Kyrgyzstan, Friday, March 8, 2013. Hagel arrived in Afghanistan Friday for his first visit as Pentagon chief, saying that there are plenty of challenges ahead as NATO hands over the country's security to the Afghans.  (AP Photo/Jason Reed, Pool)
Defense Secretary Chuck Hagel prepares to step aboard a C-17 military aircraft en route to Kabul, Afghanistan, after greeting U.S. troops stationed at Manas Air Force Base in Kyrgyzstan, Friday, March 8, 2013. Hagel arrived in Afghanistan Friday for his first visit as Pentagon chief, saying that there are plenty of challenges ahead as NATO hands over the country's security to the Afghans. (AP Photo/Jason Reed, Pool)
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