US military grounds entire fleet of Osprey aircraft in wake of deadly crash in Japan

The military announced late Wednesday it was grounding all of its Osprey V-22 helicopters, one week after eight Air Force Special Operations Command service members died in a crash off the coast of Japan. The Air Force, Navy and Marine Corps took the extraordinary step of grounding hundreds of aircraft after a preliminary investigation of last week's crash indicated that a materiel failure — that something went wrong with the aircraft — and not a mistake by the crew led to the deaths.

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