MCLEAN, Va. — A top official with the Federal Aviation Administration reassured the public on Wednesday that, despite the fear and paranoia of some, no armed drones will be permitted to fly in U.S. airspace. “We currently have rules in the books that deal with releasing anything from an aircraft, period. Those rules are in place and that would prohibit weapons from being installed on a civil aircraft,” said Jim Williams, head of the FAA's Unmanned Aircraft Systems Integration Office, in an address to the drone industry’s leading trade group meeting this week in Northern Virginia.