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In this photo provided by China's Xinhua News Agency, Chinese President Hu Jintao, center, endorses the flag of the People's Liberation Army (PLA) to the naval unit that receive the aircraft carrier "Liaoning" at the carrier handover ceremony at a naval base in Dalian, northeast China's Liaoning Province, Tuesday, Sept. 25, 2012. China formally entered its first aircraft carrier Liaoning into service on Tuesday, underscoring its ambitions to be a leading Asian naval power, although the ship is not expected to carry a full complement of planes or be ready for combat for some time. (KEYSTONE/AP Photo/Xinhua, Zha Chunming) NO SALES