HELSINKI, Finland — He called himself “Commander” online. He was a leader of an international neo-Nazi group linked to plots to attack a Las Vegas synagogue and detonate a car bomb at a major U.S.

Lt. Col. Alex Pelbath, who led the final U.S. flights out of Kabul, provided a unique perspective on the U.S. withdrawal. On "America's Newsroom," he described the experience as surreal and rewarding, ...