Helicopter Sikorsky S-80M-1 Serial 65-610 Register 8631 used by Japan Maritime Self-Defense Force JMSDF (Japanese Navy). Aircraft history and location Aircraft History 8631 Japan Maritime Self-Defense Force Sikorsky S-80M-1, c/n 65-610, ff? del JMSDF as MH-53E 8631 unk xfer 111 Kokutai, current. Send Updates Use APP to upload photo @ (optional) When Now? / / Send