CHUNKY, MISSISSIPPI—Two days ago, Mississippi six-year-old Eagle Bean decided he wanted to go on a balloon adventure. Bob Bean, Eagle’s father and US Army balloon warfare specialist, had designed a balloon spy drone with his wife that could be used to spy on terrorists. They had been working on the balloon in their backyard. The large, white balloon, designed to appear conspicuous during night-time operations, had a small compartment to hold a camera and electrical wiring. Since the balloon was