Chinese President Hu Jintao, also chairman of the Central Military Commission (CMC), 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 held at a naval base in Dalian, northeast China's Liaoning Province, Sept. 25, 2012. China's first aircraft carrier "Liaoning" was delivered and commissioned to the Navy of the Chinese People's Liberation Army (PLA) Tuesday after years of refitting and sea trials. [Photo/Xinhua]