In 1966, the U.S Army simulated a germ warfare attack on New York City. From June 6 to 10, Army agents released aerosol clouds of harmless agents that engulfed passengers in clouds of gas. Nobody paid much attention. Neither the state nor the city of New York knew about the trial run, and when a single police officer asked what they were doing, they produced false papers that satisfied any questions. The experiment was only publically detailed decades later.
