At least two more people were injured in the crash, which occurred on Thursday, says the 1st Marine Expeditionary Force Twitter.
Search and rescue efforts are still underway on Friday morning with the support of the Navy and Coast Guard.
All members of the incident service are assigned to the 15th Division of the Marine Expedition, located from Camp Pendleton.
“We are very saddened by this tragic event,” said Col. Christopher Bronzi, Commander of the EU-15. “I ask that you continue to pray for our sailors, the sailors and their families.”
This is a new story and it will be updated.