US grounds entire Osprey aircraft fleet after Japan crash

The military has grounded all Osprey V-22 helicopters following a crash off the coast of Japan that resulted in the deaths of eight Air Force Special Operations Command service members. The grounding comes after a preliminary investigation suggested a materiel failure as the cause of the crash. This move has raised concerns about the safety of the Osprey, which has been involved in multiple fatal accidents. Japan has also grounded its fleet of Ospreys.