Livelsberger enrolled in the Army’s “Advanced Special Operations Techniques” (ASOT) course, an 18-week training program at JBLM for special operations units. But Arritt said he failed to complete the course.

Master Sgt. Matthew Livelsberger, an active duty Green Beret for almost 20 years, shot himself just before the truck exploded, police said.

The driver who exploded a Cybertruck in front of the Trump hotel in Las Vegas didn't show concerning behaviors at the time he was granted personal leave from his station, the Army said.

In a Saturday night email from the U.S. Army Pentagon, a spokesperson said Master Sgt. Matthew Livelsberger, the Las Vegas Cybertruck explosion suspect, displayed no signs of concerning behavior leading up to his leave or his suicide.