Defense Secretary Pete Hegseth has fired Navy chief of staff Jon Harrison, one of his top aides who had been helping him with his unprecedented reorganization of the Pentagon's bureaucracy. The sudden sacking of a loyal higher-up at the Defense Department, now the Department of War, was initially confirmed by two defense officials and a former defense official who spoke to Politico. The Pentagon later confirmed his departure, saying in a statement, 'He will no longer serve as Chief of Staff to the Secretary of the Navy.' Harrison, the latest casualty in the Pentagon reshuffling, served about nine months in the behind-the-scenes role, where he reported to Navy Secretary John Phelan. That position is about to be filled by Hung Cao, a longtime Navy officer who was confirmed by the Senate on Wednesday.