LAS VEGAS (AP) — The person who died in the explosion of a Tesla Cybertruck packed with explosives outside President-elect Donald Trump’s Las Vegas hotel was an active-duty U.S. Army soldier, officials said Thursday.

Two law enforcement officials identified the man inside the futuristic-looking pickup truck as Matthew Livelsberger. The officials spoke to The Associated Press on the condition of anonymity because they were not authorized to discuss an ongoing investigation.

Livelsberger was a member of the Army’s elite Green Berets, a special forces unit and guerrilla warfare experts, according to an Army statement. He has served in the Army since 2006, rising through the ranks, and was on approved leave when he died, the statement said. The Green Berets work to counter terrorists abroad using unconventional techniques.