1947: Amid reports of disc- or saucer-shaped objects outperforming any known aircraft, a top secret evaluation was performed by the Air Material Command, headed by Lt. Gen. Nathan Twining, which stated that the reported circular objects were "real, not imaginary, flat on the bottom, domed on top and capable of intelligent, evasive maneuvers."
1966: U.S. Treasury Agent Donald Flickenger and several Border Patrolmen in North Dakota witnessed an astounding display of maneuverability by a UFO which defied the known and accepted scientific principles of physics and gravity. "What I saw was a metallic object that appeared to be about 30 feet in diameter and was probably about 15 feet tall at its highest point -- disc-shaped, no sound to the object at all. It hovered in our area for about three minutes, about 20 to 30 feet off the ground. Suddenly it rose up, turned over on edge, and the only thing I could see at that point were three knob-like structures that were sticking out from the underside of the object. It started spinning very rapidly, and as it spun, it started lifting up in the air and picked up speed, and all of a sudden, with a real sharp burst of speed, shot straight up in the air and was gone in a matter of seconds!"
1973: A terrifying encounter took place between a four-man crew aboard an Army helicopter and a UFO over Ohio. The mid-air drama was witnessed by several ground observers and is considered one of the most impressive sightings in history. The helicopter commander, Maj. Larry Coyne, and his crew thought at first that the light on the horizon was a radio tower beacon: "The crew chief informed me that the light was closing on the helicopter -- coming at us on a collision course," Coyne told this reporter in 1975. "I observed that the object became bigger and the light became brighter, and I began to descend the helicopter toward the ground to get out of the collision course path. It was like a missile locked onto the helicopter. We braced for impact and I looked up and observed this craft stopped directly in front of us -- stopped -- it was hovering right over the helicopter!" Coyne and his crew described the craft as "cigar-shaped, no wings, no vertical or horizontal stabilizer, approximately 60 feet long and 20 feet in height."
1980: Peruvian air force fighter pilot Col. Oscar Santa-Maria was ordered to takeoff and shoot down a sphere-shaped UFO that was in restricted airspace near an air base. Of the more than 20-minute encounter, Santa-Maria, an expert pilot, told a panel of former members of Congress earlier this year, "It was trying to avoid me while I was pursuing it and I was trying to fire. When I first fired, these were bursts of 30 millimeter shells -- a single one can destroy a truck. I shot 64 and nothing happened at all. The possibility of not hitting my target was practically impossible." The object Santa-Maria chased was 30 feet in diameter, with a dome on top, no visible engine, wings or windows. "Once I landed, I met with intelligence officers and we looked at all catalogues to see what possible spy object this might have been, but there was nothing similar to what I had observed, and we were unaware of any type of technology like this on Earth that existed."
1997: Former Arizona Gov. Fife Symington mocked thousands of people who claimed to see mysterious lights over Phoenix. He even brought out one of his staffers dressed in a cheesy ET costume during a press conference. Ten years passed before Symington apologized and admitted that he, too, witnessed an extraordinary, boomerang-shaped unknown flying craft over Phoenix. "I was expecting to see something in the distance, but was awestruck when this thing went overhead, moving steadily and quietly," Symington told HuffPost, also admitting a taboo about elected officials and UFOs. "If you hold a high public office, then the minute you start talking about UFOs or extraterrestrials, the media immediately tees off and ridicules it. If you're an elected official, you really need to be careful about what you say, because the media can just totally destroy your credibility."