Eleven crew and passengers were aboard the Navy transport plane during the crash, which took place around 2:45 p.m. Japan Standard Time.
Eight people were rescued and three remained missing after a US Navy plane crashed into the western Pacific Ocean on Wednesday, the Navy said.
"The Maritime Self-Defense Force is now searching with US forces", Japanese Defense Minister Itsunori Onodera said, according to public broadcaster NHK.
The C-2 is a twin-engine cargo plane created to transport people and supplies to and from aircraft carriers.
It was further added, "The names of the crew and passengers are being withheld pending next of kin notification".
Reports say United States military vessels has recently involved in several numbers of accidents in recent time in East Asia.
The C2-A "Greyhound" crashed about 500 nautical miles southeast of Okinawa Wednesday afternoon, on its way to the USS Ronald Reagan from Marine Corps Air Station Iwakuni.
Airbus : a history command at $ 40 billion Boeing and AerCap, a Dublin-based aviation leasing company, also announced today that EgyptAir would lease six 787-9 Dreamliners. The order on the penultimate day of the Dubai Airshow comes after what could have been a hard week for Airbus .