On October 18, 1973, an Army helicopter carrying four men was flying over Ohio when crew chief John Yanacsek noticed a red light on the horizon. Captain Lawrence Coyne initially believed it might be another aircraft, but the light began approaching at a speed that made a collision seem imminent. Coyne took the controls and began descending, eventually increasing the descent rate to approximately 2,000 feet per minute. As the object closed in, three crew members described seeing a large, gray,...