The US military has also experienced difficulties with its Osprey helicopters, with several emergency landings, a deadly crash and a piece of the chopper falling on the grounds of a Japanese school.
Two United States Marine aircraft are reported to have crashed off the coast of Japan today. Search and rescue operations were underway at the scene.
A Marine Corps KC-130 is seen in this 2016 photo.
Officials who spoke on condition of anonymity were unsure how the mishap may have occurred but none suspected foul play.
"We are thankful for the Japan Maritime Self-Defense Force's efforts as they immediately responded in the search and rescue operation", the Marines said.
U.S. Marines and Japanese authorities were searching early Thursday off the coast of Japan for missing Marines after a mishap between a fighter jet and plane used both for transporting troops and refueling, Marine officials said.
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The Marine Corps said on its Twitter account it was "aware of an incident involving Marine Corps aircraft off the coast of Japan" and that more information would be given as it became available.
No other details were provided.
The planes involved are a KC-130 and an F/A-18 based at Iwakuni near Hiroshima and were carrying seven personnel, Marines officials said.
The crash is the latest in recent series of accidents involving the US military deployed to and near Japan.
And in mid-October, an MH-60 Seahawk belonging to the same carrier crashed off the Philippine Sea after takeoff.