Disciplinary hearings in fatal sinking of Marine amphibious vehicle begin

Lt. Col. Michael Regner
Lt. Col. Michael Regner, former commanding officer of Battalion Landing Team 1/4.
(U.S. Marine Corps)

A Marine lieutenant colonel and sergeant will face disciplinary hearings this week for their roles in a series of failures that led to the deaths of eight Marines and a sailor off the San Diego coast in 2020.

Lt. Col. Michael Regner, the former commanding officer of Battalion Landing Team 1/4, will face a board of inquiry into the matter starting Tuesday at Camp Pendleton, the Marine Corps said. Separately on the base, the former platoon sergeant of the Bravo Company platoon involved in the sinking will face an administrative separation board. The Marines did not release the sergeant’s name.

A Marine Corps investigation found the 35-year-old vehicle was in ‘horrible condition’ and its crew not properly trained before embarking, reports say

March 25, 2021

On July 30, 2020, Marines training with the 15th Marine Expeditionary Unit left the amphibious transport dock ship Somerset in their assault amphibious vehicles to train on San Clemente Island. Of the 13 vehicles that left the Somerset, several had mechanical problems on the island, including the one that sank. Four AAVs didn’t attempt the return trip to the ship.


One vehicle that did try to return began having problems when its transmission failed, leading to a series of cascading problems as water began filling the vehicle. The vehicle commander hesitated to order those on board to remove their heavy body armor and evacuate. Eight Marines and a sailor, ranging in age from 18 to 23, drowned.

The decision comes more than a year after the fatal sinking near San Diego of one of the vehicles.

Dec. 17, 2021

Regner was removed from command of the battalion in October 2020. A Marine Corps investigation found that Regner should have known his unit’s assault amphibious vehicles were in poor condition and should not have been operating in the ocean. The Marines had also not been properly trained in water evacuations from the vehicles. The investigation found that Regner and other leaders relied on land-specific training to evaluate the platoon’s readiness.

According to the investigation, the first time battalion personnel embarked on AAVs during waterborne operations was July 30, when they transited from the Somerset to San Clemente Island.

Regner’s board of inquiry is scheduled through Friday.