Japanese and US officials say two American warplanes crashed into the Pacific Ocean off Japan's southwestern coast after a midair collision early Thursday, and search and rescue operations are underway.
Marine Corps officials confirmed the incident but offered little information in a statement.
The crew member was being assessed by doctors, the Marine statement said, adding that "the search and rescue operations continue for the remaining six".
A Marine Corps KC-130 aerial tanker and an F/A-18 Hornet have crashed off Japan, a defense official told Task & Purpose on Wednesday. The reports suggest the F/A-18 is a two-seat variant and five other crewmembers were on board the C-130.
"The circumstances of the mishap are now under investigation", the statement said.
It was unclear if USA military officials were also assisting with the search.
The Marines said in a statement that Japanese search and rescue aircraft responded and were aiding in the rescue effort.
The Marine Corps said the planes "were conducting regularly scheduled training when the mishap occurred".