In this photo provided by China's Xinhua News Agency, military officers stand onboard China's aircraft carrier "Liaoning" in Dalian, northeast China's Liaoning Province, Tuesday, Sept. 25, 2012. China formally entered its first aircraft carrier 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. (AP Photo/Xinhua, Zha Chunming) NO SALES
