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In page People's Liberation Army Navy:

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The 350,000-person Navy included Naval Air Force units of 34,000 men, the Coastal Defense Forces of 38,000, and the Marine Corps of 56,500. Navy Headquarters, which controlled the three fleet commands, was subordinate to the PLA General Staff Department. In 1987, China's 1,500 km coastline was protected by approximately 70[citation needed] diesel-powered Romeo- and Whiskey-class submarines, which could remain at sea only a limited time.