Guan Bolin (L), mission commander of China's naval hospital ship Peace Ark, presents a Chinese naval badge to Melanie Merrick, medical treatment facility commanding officer of U.S. naval hospital ship Mercy in San Diego, the United States, Nov. 5, 2015. China's naval hospital ship Peace Ark called at San Diego, Southern California, on Tuesday, kicking off a five-day friendly port visit to United States. (Photo: Xinhua/Yang Lei)
