TOKYO -- Off the coast of Japan's glittering capital, the U.S. Navy recently dropped a hint about its shifting strategy in Asia.

An MH-60R helicopter is seen aboard the USS Ralph Johnson, an Arleigh Burke-class guided-missile destroyer based in Yokosuka, during a sail through the South China Sea in January. © U.S. Navy
Adding helicopter hangars to ships expands area of operation across Indo-Pacific