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)