At about a quarter to six on April 24, 1964, Socorro police sergeant Lonnie Zamora was chasing a speeder south of town when he heard a roar and saw a flame come down beyond a hill.
In an arroyo he found a shiny white oval standing on legs, with a red insignia on its side and no windows or doors that he could see. Two small figures in white coveralls stood beside it. The object lifted off with a roar and a flame, then left almost silently. Investigators found depressions in the ground and burned brush.
Project Blue Book's chief, Hector Quintanilla, called it one of the best-documented cases on record, and Blue Book filed it as unidentified. Years later a hoax by students at New Mexico Tech was proposed, based on a 1968 letter found in the papers of chemist Linus Pauling.