"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".
Of the seven crew members on board the planes - five on the KC-130 and two on the F/A-18 - only one has been found so far.
The KC-130 is an extended-range tanker version of the C-130 and is used for mid-air refuelling.
Search and rescue operations are underway.
Two United States Marine aircraft crashed off the coast of Japan on Wednesday.
The Marine Corps said the rescued crew was taken to a hospital at its base in Iwakuni and was being treated, but did not provide any other details.
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The Marines said in a statement that Japanese search and rescue aircraft responded and were aiding in the rescue effort.
The crash comes just a month after a US F/A-18 Hornet from the aircraft carrier USS Ronald Reagan crashed into the sea southwest of Okinawa.
The US military has about 50,000 troops stationed in Japan.
In November, a U.S. navy fighter jet crashed into the sea off Japan's southern island of Okinawa and its 2 crew members were rescued alive.
It was unclear if U.S. military officials were also assisting with the search.