Okinawa police arrested a U.S. Marine on Oct. 3 on suspicion of killing a Japanese woman at a hotel, Stars and Stripes reported. The arrest comes as the U.S. military prepares to deploy its NMESIS anti-ship missile launcher to Yonaguni Island for the Keen Sword exercise, which is set to begin Oct. 19 and run for 11 days.
Details of the arrest were limited. Stars and Stripes did not name the Marine, the victim, or the hotel, and did not state the date of the alleged killing. Police have not released further information, and the Marine’s status with the military was not specified.
Separately, the U.S. military will deploy the Navy-Marine Expeditionary Ship Interdiction System (NMESIS) to Yonaguni, Japan’s westernmost inhabited island, about 107 km (66 miles) from Taiwan, during Keen Sword, Kyodo News reported Oct. 2, citing the Yonaguni town government. NHK reported it will be the first time NMESIS is deployed on Yonaguni. Neither government has said how many launchers will go, how long they will stay, or whether any missiles will be fired.
NMESIS is a Marine Corps system built on an unmanned Joint Light Tactical Vehicle carrying two Naval Strike Missiles, which can hit ships at ranges of more than 185 km (115 miles). The system belongs to the 12th Marine Littoral Regiment, based on Okinawa, which formally received NMESIS in June 2026. The regiment previously deployed its AN/TPS-80 G/ATOR radar to Yonaguni during Resolute Dragon in 2024.
Japan has stationed troops on Yonaguni since 2016, when a Ground Self-Defense Force coastal surveillance unit and radar began operating there. Tokyo announced in February 2026 plans to place surface-to-air missiles on the island by 2031.
The arrest and the deployment come as the U.S. and Japan conduct Keen Sword, a biennial exercise. The Marine’s arrest could affect host-nation relations, though no official has commented on that possibility. The exercise is scheduled to proceed as planned.
Sources: Defence Blog · Stars and Stripes