WASHINGTON—Six anti-war protestors disrupted an autonomous warfare discussion featuring Pentagon chief Pete Hegseth and the military service secretaries Wednesday at the Army’s annual conference. By the time the third protester shouted denouncements of the U.S.-Iran war, some members of the audience had begun chanting “USA, USA.” The politically charged atmosphere isn’t typical at the show. But this year, it served as a contrast for what appeared to be a more p