U.S. Defense Secretary Leon Panetta meets with troops at Kabul International Airport in Kabul, Afghanistan, Friday, Dec. 14, 2012, before boarding his plane and heading back to Washington. The Pentagon says it will send Patriot air defense missiles and 400 troops to Turkey as part of a NATO force meant to protect Turkish territory from potential Syrian missile attack. (AP Photo/Susan Walsh, Pool)

Photo by: Susan Walsh

U.S. Defense Secretary Leon Panetta meets with troops at Kabul International Airport in Kabul, Afghanistan, Friday, Dec. 14, 2012, before boarding his plane and heading back to Washington. The Pentagon says it will send Patriot air defense missiles and 400 troops to Turkey as part of a NATO force meant to protect Turkish territory from potential Syrian missile attack. (AP Photo/Susan Walsh, Pool)