U.S. Defense Secretary Leon Panetta, left, goes to shake hands with Army Maj. Gen. Robert Abrams, right, after Abrams introduced Panetta to the troops during a visit to Kandahar Airfield in Kandahar, Afghanistan, Thursday, Dec. 13, 2012.  (AP Photo/Susan Walsh, Pool)

Photo by: Susan Walsh

U.S. Defense Secretary Leon Panetta, left, goes to shake hands with Army Maj. Gen. Robert Abrams, right, after Abrams introduced Panetta to the troops during a visit to Kandahar Airfield in Kandahar, Afghanistan, Thursday, Dec. 13, 2012. (AP Photo/Susan Walsh, Pool)