NEW YORK/WASHINGTON (Reuters) -Roughly a week after Donald Trump started his second term as president, the U.S. military issued an order to three freight airlines operating out of Dover Air Force Base in Delaware and a U.S. base in Qatar: Stop 11 flights loaded with artillery shells and other weaponry and bound for Ukraine. Who had ordered the U.S. Transportation Command, known as TRANSCOM, to halt the flights? Top national security officials — in the White House, the Pentagon and the State Department — couldn’t provide answers.