Major Akinori Hosomi vanished on a cool evening in April 2019 while flying Japan’s most modern and deadliest aircraft — the F-35A Joint Strike Fighter. The mission was a routine night-training exercise. Yet his plane fell into the Pacific Ocean without so much as a distress call on the part of the pilot. Akinori Hosomi’s remains were recovered from the seabed months later leaving behind a mystery about the first fatal crash for the Pentagon’s most expensive weapons system.