US observers view the search-and-rescue exercise aboard Chinese navy's missile destroyer Qingdao near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

Chinese and US naval vessels and helicopters participate in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

Chinese and US naval vessels and helicopters participate in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

Chinese and US marines participate in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

Chinese and US marines and helicopters participate in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

Chinese and US naval vessels and helicopters participate in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

Chinese and US naval vessels participate in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

A Chinese navy's helicopter participates in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

Chinese and US naval vessels and helicopters participate in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

A helicopter aboard Chinese navy's missile destroyer Qingdao leaves for rescue mission during a joint search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

A Chinese navy's helicopter participates in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

Chinese marines participate in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

Chinese and US naval vessels participate in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

Chinese and US naval vessels and helicopters participate in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)

 

Chinese and US naval vessels participate in a search-and-rescue exercise near Hawaii, the United States, Sept. 9, 2013. Four naval ships, including Chinese navy's missile destroyer Qingdao, missile frigate Linyi and USS Lake Erie, and three helicopters, conducted a joint search-and-rescue exercise near Hawaii on Monday. (Xinhua/Zha Chunming)