According to this article, from the Independent, there have been a whole series of sexual assaults by US service personnel in Japan. A US airman called Armando Valdez is the latest to face charges there, for apparently molesting a 10 year old girl:
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In 1995, two marines and a sailor kidnapped and gang-raped a 12-year-old girl before leaving her for dead in a crime that capped years of sexual assaults and which caused the largest anti-US demonstrations since the end of the Second World War. Since then, the military has maintained an uneasy truce with islanders after agreeing to co-operate more closely with the Okinawa authorities in investigating crimes by its own personnel, and to return Futenma air base, which occupies 25 per cent of Okinawa’s second city, Ginowan.