REF: UAP/1950s/034Unexplained
1952-09-19-20
Operation Mainbrace sightings
North Sea / RAF Topcliffe · UK/NATO·Military exercise sightings·1950s
Unexplained
§ ASummary
During NATO's largest postwar exercise, silver disc photographed from USS FDR carrier deck; RAF Topcliffe pilots saw disc following a Meteor jet; prompted RAF to take UFOs seriously.
§ BWitnesses
USS FDR crew (reporter Wallace Litwin); RAF Topcliffe aircrew
§ CEvidence & Documentation
Photographs (never publicly released); RAF/USN reports
§ DOfficial Investigation
RAF & USN inquiries; discussed by Blue Book
§ EStatus Assessment
Unexplained
§ FVerifiable Sources
Ruppelt (1956); UK MoD files (TNA); Good, 'Above Top Secret' (1987)
§ GCross-referenced cases6
1950-05-11🇺🇸 USA
McMinnville (Trent) photos
Photographic
1950-08-15🇺🇸 USA
Mariana film
Film
1950-03-16🇺🇸 USA
Farmington 'armada'
Mass sighting
1951-08-25🇺🇸 USA
Lubbock Lights
Photographic / mass sighting
1951-09-10🇺🇸 USA
Fort Monmouth radar-visual
Radar-visual
1952-07-14🇺🇸 USA
Nash-Fortenberry sighting
Airline crew sighting