The Hengshui (left), a new type of frigate recently put into service, and the Jinggangshan, China's most advanced amphibious transport dock with the largest shipping tonnage, anchor in the military port of Sanya in southern China's Hainan Province, on March 19, 2013. Four warships of the South China Sea Fleet depart from the military port in Sanya to the South China Sea and the Western Pacific waters on patrol and training missions. [Photo/Xinhua]