(Tribune News Service) — The Naval Criminal Investigative Service is probing the death of a retired military officer whose body was found at the Twentynine Palms Marine base, officials said.

Retired Maj. Gen. William F. Mullen was found dead at the Twentynine Palms base Saturday, according to San Bernardino County coroner’s records.

Mullen, at one time the commanding general of the base, retired in 2020.

San Bernardino County sheriff’s spokesperson Mara Rodriguez confirmed that NCIS is investigating the death at the facility, which is the world’s largest Marine Corps training base.

NCIS confirmed the agency was investigating the death. A spokesperson said the investigation is standard for “any non-combat, medically unattended fatalities” involving service members.

The spokesperson declined to comment further while the investigation was ongoing.

“Maj. Gen. Mullen’s dedicated service to our nation and the Marine Corps will always be remembered,” said Maj. Gen. Thomas Savage, commanding general of the Marine Air Ground Task Force Training Command. “Our thoughts and prayers are with his loved ones.”

Marine officials confirmed NCIS is investigating the cause of death.

San Bernardino coroner’s officials are handling the autopsy, Rodriguez said. That investigation is ongoing.

Before his retirement, Mullen served as commanding general of the Training and Education Command, according to the U.S. Marine Corps. His extensive military background includes tours of duty in the Middle East, leading a counter-narcotics mission in the Los Padres National Forest and serving as Marine aide to President Clinton.

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