tokyo japan defense ministry sunday say search three crew members maritime self-defense force msdf helicopter sea japan contact lose chopper one crew member rescue uninjured ministry say sh-60j anti-submarine warfare helicopter lose contact around 90 km 56 miles coast aomori prefecture late saturday say flight data recorder locate say actually happen helicopter whether crash ditch sea msdf launch investigation incident early month four japanese crew members injure ch-101 chopper crash land train exercise iwakuni air base yamaguchi prefecture western japan three miss japan military helicopter lose contact sea japan