"Search and rescue operations continue for a KC-130 and an F/A-18 that were involved in a mishap off of the coast of Japan around 2:00 a.m. December 6".
Marine Corps officials confirmed the incident but offered little information in a statement.
Search and rescue operations are underway.
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United States media reported five crew were on the C-130 and two on the F-18. The status of the other Marines was not immediately available.
The McDonnell Douglas F/A-18 Hornet is a fighter and attack aircraft and can carry a wide range of missiles and bombs.
There is no official word on where the incident took place.
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Second Lieutenant Alyssa Morales, a spokeswoman for the 1st Marine Aircraft Wing based in Okinawa, told military news site Task and objective that one of the Marines had been rescued alive, but this could not be immediately confirmed.
The survivor is being assessed by doctors at MCAS Iwakuni.
He says it is not clear what the weather conditions were like but overnight there was widespread cloud and rain across the Japanese archipelago.
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The FA-18 and the KC-130 from the Iwakuni base were conducting routine training when they collided some 100 kilometers south of Cape Muroto in Kochi Prefecture at around 1:40 a.m., according to the ministry.