UFO Timeline
Air Force Letter 200-2A (2 November 1953) modified Air Force Letter 200-2 entitled “Unidentified Flying Objects Reporting” (“FLYOBRPT”).
On 3 November 1953, a UFO was reportedly seen by Flying Officer Terry Johnson and his navigator, Flying Officer Geoffrey Smythe, during a flight in a Vampire fighter from RAF West Malling.
(Commonly referred to as “the West Malling incident”).

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This incident involved pilot Lt. Felix Moncla Jr and radar observer Lt R R Wilson.
This incident is Case 54 in Isaac Koi's "Top 100" article, since it was referred to in 52 of the books covered by that article.
This incident came seventh in a survey in 1965 by Jacques Vallee of the opinion of various UFO groups as to the most significant UFO sightings.

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