On Friday, public broadcaster NHK and other Japanese media said the unidentified 24-year-old serviceman, from the Kadena air base, entered an unlocked third-floor apartment in the building that housed the bar at around 1 a.m., punched a sleeping 13-year-old boy in the face and kicked over a television set, breaking it. He then jumped out the window, sustaining injuries that required hospitalization, reports said.