Naval officers prepare to board the frigate Xuzhou, in Zhoushan, east China's Zhejiang province, July 15, 2009. The Xuzhou will join another frigate with two ship-borne helicopters and a supply vessel with a crew of over 800 in the third fleet of anti-piracy ships the Chinese navy is sending to patrol the waters off Somalia. The fleet, which leaves for the Gulf of Aden today, will replace a previous anti-piracy fleet that has been stationed in the Gulf since early April. [Xinhua]