While we've already seen a few US national parks clamp down on drones in their airspace, it now looks like that no-fly rule is about to extend across the country. The National Park Service tells the Associated Press that it's about to order all 401 of its parks to ban unfettered use of drones on their grounds. Each park will have exceptions for high-altitude flyers, hobbyist clubs, researchers and rescuers, but you won't get to lug your personal camera drone around purely for the sake of remote sightseeing. If all goes according to plan, the Service will also have a preliminary national rule drafted within 18 months.