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Leon Panetta

U.S. Defense Secretary Leon Panetta, left, shakes hands with China's Vice President Xi Jinping at the Great Hall of the People in Beijing, China. Panetta met with Chinese leader-in-waiting Xi, who just days ago reappeared after a puzzling two-week disappearance.

AP/PTI

U.S. Secretary of Defense Leon Panetta, second from left, walks with Commander Air Power Generation Command Col. Sarbjit Singh, left, Defense and Naval Attache for Singapore Capt. John Wood, second from right, and Singapore Defense Attache to the U.S. Brig Gen. Chee Wee Tan before departing Paya Lebar Airfeild, Singapore.

AP/PTI

U.S. Defense Secretary Leon Panetta, left, meets with Afghanistan's President Hamid Karzai in Kabul. Afghan lawmakers expressed anger over the U.S. move to fly an American soldier accused of killing 16 civilians out of the country to Kuwait, saying Kabul shouldn't sign a strategic partnership agreement with Washington unless the suspect faces justice in Afghanistan.

AP Photo/ Mohammad Ismail, Pool

Afghanistan President Harmid Karzai leans toward Defense Secretary Leon Panetta prior to the start of their joint news conference at the Presidential Palace in Kabul, Afghanistan.

AP Photo/Pablo Martinez Monsivais, Pool

US Secretary of Defense Leon Panetta delivers remarks to the troops during his visit to Camp Victory in Baghdad. The U.S. will not "walk away" from the challenge of Iran's stepped-up arming of Iraqi insurgents who are targeting and killing American troops, U.S. Defense Secretary Leon Panetta said.

(AP Photo/Paul J. Richards, Pool

Leon Panetta is sworn is as US Defense Secretary by the Pentagon General Counsel Jeh Johnson at the Pentagon, Virginia, USA.

AP Photo/Evan Vucci

CIA Director Leon Panetta, right, leaves after briefing members of Congress on Capitol Hill Tuesday, May 3, 2011 in Washington.

AP/PTI