Shirar, 27, of Baytown, Texas, and Flint, 21, of Fort Ann, N.Y., died when the water truck they were riding in overturned during an exercise at the Marine Corps base north of Oceanside.
Flint was an equipment operator assigned to the Amphibious Construction Battalion One homeported in Coronado.
The Navy said Shirar also was an equipment operator assigned to the battalion from Reserve Detachment 107 headquartered in Houston, Texas.
The Marine Corps is investigating the accident that occurred when the 7-ton, six-wheel-drive truck they were in was involved in an accident at about 8 a.m.
The battalion was taking part in Pacific Horizon, a Navy-Marine Corps operation aimed at training troops to bring personnel and equipment ashore.
A third sailor injured in the accident who has not been identified was taken to a local hospital for treatment.
Monday's accident occurred less than two months after a Marine Corps instructor was killed when an amphibious assault vehicle sank at the base's Del Mar Boat Basin and he was unable to get out of the vehicle.
Killed in that mishap was Sgt. Wesley Rice, 27, of San Antonio.
The cause of that accident also remains under investigation
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