US submarine makes quiet, yet deliberate visit to Japan

YOKOSUKA, Japan -- Port visits by nuclear-powered submarines are never announced beforehand. Neither is the duration of the stay or the planned date of departure. They just quietly surface without warning, as the U.S. Navy's Ohio-class guided-missile submarine (SSGN) USS Michigan did this week here in Yokosuka, home to the U.S. Navy's 7th Fleet.