U.S. and allied mariners and airmen, accordingly, must study China’s martial traditions, gleaning insight into how offshore active defense might unfold in the South China Sea. If you’re Beijing and have built up a seagoing militia, an impressive coast guard, Asia’s biggest indigenous navy, and a sizable arsenal of land-based weaponry to influence events at sea, how do you alloy those components into a sharp combat implement—and consolidate control over a semi-enclosed sea?