The arrival of the first group of MV-22 Osprey aircraft in Japan last week amid strong safety concerns means the central government has effectively committed itself to preventing accidents far into the future.
The safety of the U.S. tilt-rotor transports, deployed for actual operations less than five years ago, has yet to be fully established.
Still, once Ospreys are based at U.S. Marine Corps Air Station Futenma in Okinawa later this year as planned, they will fly over most of Japan. In addition, U.S. military helicopters are usually operated for some 40 years after deployment.
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