China's patrol vessels set out for patrol mission in South China Sea(4/6)

Patrol vessel Haixun-21 prepares to set off for a patrol mission at a port in Sanya, south China's Hainan Province, April 21, 2015. The patrol vessel Haixun-21 and Haixun-1103 have set out for a 3-day patrol mission on the waters of Xisha Islands in South China Sea. (Photo: Xinhua/Guo Cheng)