A military exercise that happened in the 1950's had some surprising results and what seemed to be very interesting...and fast...visitors checking in on them. Multiple witness reports and radar indications later, we still don't know what it was. But we have an idea...

https://www.history.com/news/ufo-sightings-cia-robertson-condon

https://en.wikipedia.org/wiki/Exercise_Mainbrace

The strangest and most unusual UFO sightings in Yorkshire; the Yorkshire post, Thursday, 5th April 2018 https://www.yorkshirepost.co.uk/news/strangest-and-most-unusual-ufo-sightings-yorkshire-48448

The UFO Sightings that Pushed the UK to Take 'Flying Saucers' More Seriously :The incidents interrupted Exercise Mainbrace, a massive set of NATO war-game maneuvers. JAN 15, 2020 DAVE ROOS https://www.history.com/news/uk-ufos-mainbrace-nato

When UFOs Buzzed the White House and the Air Force Blamed the Weather: When a slew of saucer-like sightings was reported over Washington, D.C. in 1952, the Air Force blocked its own investigator from checking them out. Sept 6, 2018; Jan 15, 2020. DAVE ROOS https://www.history.com/news/ufos-washington-white-house-air-force-coverup

LIFE Magazine - April 7, 1952http://www.project1947.com/shg/articles/lifemag52.html

The Unexplained North: UFO sightings rife in the North East, Is there anybody out there? It would appear there is if our tales of unidentified flying objects are to be believed 23 FEB 2014 By Mike Kelly https://www.chroniclelive.co.uk/news/local-news/unexplained-north-ufo-sightings-rife-6736729

Operation Mainbrace UFOs https://drdavidclarke.co.uk/secret-files/operation-mainbrace-ufos/

THE UFO FILES: THE INSIDE STORY OF REAL-LIFE SIGHTINGS: DAVID CLARKE An edited extract from The UFO Files First published in 2009 by The National Archives Kew, Richmond, Surrey TW9 4DU United Kingdomhttps://www.nationalarchives.gov.uk/documents/the-ufo-files-extract.pdf

The CIA UFO Papers: 50 Years of Government Secrets and Cover-Ups By Dan Wright http://www.project1947.com/shg/ukufo/1952topcliffe.htm

Churchill ordered UFO cover-up, BBC news, National Archives show Published August 5, 2010 https://www.bbc.com/news/uk-10853905

https://www.nationalarchives.gov.uk/documents/the-ufo-files-extract.pdf

OPERATION MAINBRACE SIGHTINGS In the vicinity of Denmark & Norway September, 1952 http://www.nuforc.org/Mainbrace.html

https://winstonchurchill.org/resources/in-the-media/churchill-in-the-news/the-churchill-centre-responds-to-qwsc-and-ufosq/

https://www.cia.gov/library/readingroom/docs/DOC_0000015464.pdf

https://mysteriousuniverse.org/2014/04/ufos-nato-the-mainbrace-affair/ Finding Our Place in the Cosmos: From Galileo to Sagan and Beyond: the library of Congress https://www.loc.gov/collections/finding-our-place-in-the-cosmos-with-carl-sagan/articles-and-essays/life-on-other-worlds/ufos-and-aliens-among-us

That Time Winston Churchill Wrote About Aliens: How did Winston Churchill distract himself from the impending threat of Nazi Germany in 1939? According to a recently discovered essay, he wrote about extraterrestrials. SARAH PRUITT UPDATED: JAN 16, 2020, ORIGINAL: FEB 16, 2017 https://www.history.com/news/that-time-winston-churchill-wrote-about-aliens

UFOs & NATO: The Mainbrace Affair Nick Redfern April 22, 2014 https://mysteriousuniverse.org/2014/04/ufos-nato-the-mainbrace-affair/

'Project Blue Book' Is Based on a True U.F.O. Story. Here It Is. By Ralph Blumenthal and Leslie Kean Jan. 15, 2019 https://www.nytimes.com/2019/01/15/arts/television/project-blue-book-history-true-story.html

Declassified Drawings from the British Government's UFO Desk "UFO Drawings From The National Archives" by David Clarke publishes eyewitness illustrations of unidentified flying objects. by Allison Meier November 13, 2017 https://hyperallergic.com/409997/ufo-drawings-national-archives-book/

http://documents.theblackvault.com/documents/ufos/UK/defe-24-2028-1-1.pdf

Good (2007), 106-107, 111; USAFE Item 14, TT 1524, (Top Secret), 4 November 1948, declassified in 1997, National Archives, Washington D.C.

https://www.history.com/topics/paranormal/history-of-ufos

http://documents.theblackvault.com/documents/ufos/UK/defe-24-2028-1-1.pdf

UFO: Britain releases documents explaining closure of military UFO desk: The National Archives has been releasing declassified Ministry of Defense files on UFOs in the UK for the past five years. June 21, 2013 By Cassandra Vinograd Associated Press https://www.csmonitor.com/Science/2013/0621/UFO-Britain-releases-documents-explaining-closure-of-military-UFO-desk

https://www.telegraph.co.uk/news/newstopics/howaboutthat/ufo/7926037/UFO-files-Winston-Churchill-feared-panic-over-Second-World-War-RAF-incident.html

CIA tweets 'It was us' on Norway's 1950s UFO sightings By Anne Sewell (July 6, 2014)

http://www.project1947.com/47cats/usnavydraft1.htm#1850

Why Would the Government Lie About Aliens? Because there are so many potential answers, believers can choose the one that makes most sense to them. By SARAH SCOLES, FEBRUARY 29, 2020 https://slate.com/technology/2020/02/response-it-came-from-cruden-farm.html