Brief mention on the BBC, but top news in Japan for the last few days. Senior military brass including a Division Commander on board. Sudden disappearance from radar within 2 minutes of conversing with ATC, liferaft found still folded, no emergency beacon activated. Conspiracy theorists are asking if it could have been shot down by a Chinese ship, but there is no evidence of that. Floating bits include a cockpit door, a section of rotor blade, half a fuel tank and today a crew helmet. Local fishermen say the winds in this season can change suddenly from a gentle southerly to a fierce northly blast.
Japan's missing military helicopter likely crashed into sea - BBC News
Body reportedly seen in waters following GSDF chopper disappearance - Japan Today
Missing SDF helicopter had normal radio communications before vanishing - Japan Today