The men, Master Sgt. Matthew Livelsberger and Shamsud-Din Jabbar, who were both killed in the incidents, never served in the same unit, according to unit histories provided by the Army.

Master Sgt. Matthew Livelsberger, a highly decorated Special Forces soldier, had three recent visits for mental health treatment.

Matthew Livelsberger, the Colorado Springs soldier who died by suicide while blowing up a Tesla Cybertruck on New Year's Day outside President-elect Donald Trump's hotel in Las Vegas, used ChatGPT to help plan the attack,