Date: September 13-25, 1952
Shortly after the reply to Churchill dismissing UFOs was issued, a major UFO case developed which, according to USAF officer Edward J. Ruppelt, forced the RAF into recognizing UFOs were a reality. “It was these sightings, I was told by an RAF exchange intelligence officer in the Pentagon that caused the RAF to officially recognize the UFO”.
"Operation Mainbrace” was the largest NATO exercise of its time, held during September of 1952, in Europe. Operations commenced on September 13th and lasted twelve days.
On the first full day, Sept 13th, the crew of Danish destroyer Willemoes witnessed a triangular UFO. The incident began a series of sightings during Operation Mainbrace.
Personnel of the U.S.S. Franklin D. Roosevelt, an aircraft carrier participating in Operation Mainbrace, saw a silvery, spherical object. The UFO was moving across the sky behind the fleet. Reporter Wallace Litwin took a series of colour photographs, which were examined by Navy Intelligence officers. Rumours also circulated that Eisenhower was aboard at the time of these sightings.
Captain Edward J.Ruppelt said regarding the pictures:
“On September 20, a U.S. newspaper reporter aboard an aircraft carrier in the North Sea was photographing a carrier take-off in color when he happened to look back down the flight deck and saw a group of pilots and flight deck crew watching something in the sky. He went back to look and there was a silver sphere moving across the sky just behind the fleet of ships. The object appeared to be large, plenty large enough to show up in a photo, so the reporter shot several pictures. They were developed right away and turned out to be excellent. He had gotten the superstructure of the carrier in each one and, judging by the size of the object in each successive photo, one could see that it was moving rapidly.”