Defense Department officials announced Friday new senior advisers to Secretary Pete Hegseth to fill the void left by the turnover in his staff over the last couple of weeks. Sean Parnell, who has served as the assistant to the defense secretary for public affairs,

WASHINGTON—Defense Secretary Pete Hegseth has discharged members of Pentagon advisory boards on defense policy and military technology, adding to the upheaval during his time at the Pentagon, current and former officials said.