Four Japanese troops were injured when a device suddenly exploded at a storage site for unexploded ordnance at the U.S. Air Force base on Okinawa.
The exercise extended communications, reconnaissance and targeting across wide swaths of the Pacific region.
Marine Fighter Attack Squadron 211, based in Yuma, Arizona, recently deployed to Marine Corps Air Station Iwakuni, Japan.
Deteriorating weather conditions were likely a factor in the Marines going missing, the Marine Corps said.
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