CASE FILE GB-1956-001

Lakenheath and Bentwaters Radar-Visual Events

13 August 1956 · RAF Lakenheath and RAF Bentwaters, Suffolk, England · Location generalized (Regional) · GB

Official finding

The Condon Committee's own case study concluded, "although conventional or natural explanations certainly cannot be ruled out, the probability of such seems low in this case and the probability that at least one genuine UFO was involved appears to be fairly high" — an unusually strong statement of non-identification for a report otherwise inclined toward conventional explanations.

Condon Committee (University of Colorado UFO Project, under USAF contract)

Scientific Study of Unidentified Flying Objects (Condon Report)

Anomaly Index assessment

Unresolved: corroborated

Ground-based GCA radar at RAF Bentwaters, a separate radar unit at RAF Lakenheath, the airborne interception radar of a scrambled RAF Venom, and independent visual observations from ground personnel and aircrew all documented the same or closely related targets over several hours, giving this case multiple, partly independent evidence channels rather than a single sensor or witness. The Condon Committee's own evaluated explanations, principally radar anomalous propagation and misidentification, were judged by its investigator not to adequately account for the sustained, patterned target behavior, including apparent instantaneous stops and the target's movement to a position behind the intercepting fighter. Because credible, multi-channel evidence was evaluated and not resolved by any tested conventional explanation, this case meets the Index's higher corroborated threshold rather than the lower insufficient-data category.

Anomaly Index assessments are editorial evaluations of the public record. They are not official government determinations.

Unresolved means that the available evidence does not support a reliable identification. It does not imply extraterrestrial or nonhuman origin.

What was reported

Ground radar operators at RAF Bentwaters reported tracking a target approaching from the east at speeds estimated between 4,000 and 2,000 miles per hour beginning around 21:30 on August 13, 1956, along with a separate slow-moving group of returns that later appeared to merge into one large return. A civilian pilot flying a C-47 reported a bright light pass beneath his aircraft at roughly the same time and location. Around 22:55, ground personnel and a radar unit at RAF Lakenheath, some 40 kilometers northwest, reported a stationary target that began moving at 400 to 600 miles per hour, making sudden changes of direction with no observed acceleration and pausing motionless for three to six minutes between movements. A Royal Air Force Venom night fighter, flown by Flying Officer David Chambers with navigator John Brady, was vectored onto the stationary target by ground control; Chambers reported gaining radar lock at close range before the target appeared to maneuver behind his aircraft. Over the radio he was recorded asking, "Where did he go? Do you still have him?" while ground controllers confirmed a return remained behind the interceptor through roughly ten minutes of evasive climbs, dives, and turns. The Venom broke off the pursuit for fuel, and Technical Sergeant Forrest Perkins, the Lakenheath radar watch supervisor, later wrote to the Condon Committee describing the target's motion as unlike anything he had tracked before or since.

What is verified

Ground radar at RAF Bentwaters and a separate radar unit at RAF Lakenheath independently reported unidentified targets on the night of August 13-14, 1956.[2]
A Royal Air Force Venom interceptor was vectored onto a radar target and its pilot reported briefly gaining radar lock before the target appeared to reposition behind the aircraft.[2]
The event, or series of events, extended over roughly five hours and involved ground radar, airborne radar, ground visual, and airborne visual channels.[2]
The Condon Report's own case study (Case 2) concluded conventional explanations could not be ruled out but judged their probability low, and rated the probability that a genuine unidentified object was involved as fairly high.[2]
RAF Lakenheath remains an active military installation. Consistent with Anomaly Index's sensitive-site policy, this record uses generalized regional coordinates spanning both stations rather than precise base coordinates. Proximity to a military facility does not by itself establish any connection between the facility's operations and the reported event.

Evidence ledger

Evidence items documenting this case
Type	Description	Originality	Source organization	Released	Raw or edited	Metadata	Provenance	Known limitations	Source
Radar	Independent ground radar detections at RAF Bentwaters and RAF Lakenheath, plus airborne interception radar aboard the scrambled Venom fighter.	Original	Royal Air Force; United States Air Force	1956 (event); 1969 (Condon Report case study)	Unknown	Partial	Reconstructed by Condon Committee investigator Gordon David Thayer from written statements, a classified 3910th Air Base Group teleprinter message, and later correspondence and interviews with several of the personnel involved, including a 1968 letter from radar supervisor Forrest Perkins.	No radar scope photography from the night is known to survive; the reconstruction rests on operator logs, message traffic, and recollection, some of it gathered more than a decade after the event.	[2]
Military eyewitness	Visual sightings by ground personnel at both stations and by the Venom aircrew, reported independently of the radar detections.	Original	Royal Air Force; United States Air Force	1956	Raw	Partial	Recorded in personnel statements gathered by the Condon Committee.	Visual descriptions of night lights are difficult to range and are subject to the same identification limits as any night sighting.	[2]

Proposed explanations

Radar anomalous propagation and equipment/operator error

Proposed by Condon Committee investigator Gordon David Thayer (1969), evaluating the case for the Committee

Supporting: Thayer's own analysis noted that "any conventional explanation... would seem to require some sort of radar anomalous propagation," a known phenomenon capable of producing false or distorted returns under certain atmospheric conditions.

Contradicting: Thayer also wrote that the "generally continuous and consistent" movements tracked that night "are not at all typical of radar false targets," and the correlation between the Lakenheath radar target and the Venom's own airborne radar lock is harder to attribute to ground-based propagation error alone.

Disputed

Misidentified aircraft or meteor activity

Proposed by Skeptical reviewers including Philip J. Klass, cited in later commentary on the case

Supporting: Both RAF stations sat near active civil and military air corridors, and meteor and bright-star misidentification are common explanations for isolated night radar-visual reports.

Contradicting: The reported sustained, multi-hour duration, the target's apparent response to the intercepting fighter's maneuvers, and the agreement between two separate ground radars and the aircraft's own radar are not well explained by a fleeting meteor or a single misidentified aircraft.

Disputed

Why this classification?

This case is classified as Unresolved: corroborated because multiple, partly independent evidence channels, two separate ground radar units, an airborne interception radar, and both ground and air visual witnesses, documented related targets over several hours, and the Condon Committee's own investigator found that the evaluated conventional explanations did not adequately account for the pattern of movement, particularly the target's apparent response to the intercepting fighter. This is a high threshold reserved for cases with genuinely multi-channel documentation; unresolved does not mean extraordinary or nonhuman, only that no tested conventional explanation fits the available record.

What remains unknown

Whether the Lakenheath ground radar target and the Venom's airborne radar contact were tracking the same physical phenomenon or two separate effects that coincided in time.
What, if anything, caused the target to appear behind the intercepting aircraft during the chase.
Whether any UK Air Ministry file from 1956 itself, rather than later correspondence and interviews, still survives; pre-1960s Ministry of Defence UFO material was reportedly not retained as a matter of routine records policy.

Classification history

1956
Listed without identification at the time of the event — Royal Air Force / United States Air Force
1969
Unresolved; "the probability that at least one genuine UFO was involved appears to be fairly high" — Condon Committee (University of Colorado UFO Project)
Case 2 of the Condon Report.
2026
Unresolved: corroborated — Anomaly Index

Sources

Primary source: Tier A
Project BLUE BOOK — Unidentified Flying Objects (records collection) (opens in new tab)National Archives and Records Administration · 1947–1969 (records); collection description current
Source provenance note
Canonical archival collection for U.S. Air Force UFO investigations (Projects Sign, Grudge, and Blue Book). Individual case files are held in Record Group 341 and available on microfilm and through NARA's catalog.
Primary source: Tier A
Scientific Study of Unidentified Flying Objects (Condon Report) (opens in new tab)University of Colorado (under U.S. Air Force contract) · 1968 · archived copy (opens in new tab)
Source provenance note
Air Force–commissioned academic study led by physicist Edward Condon. Contains detailed case analyses, including several the study itself left unexplained. Full text mirrored by the National Capital Area Skeptics with permission; the original was published by the University of Colorado in 1968 and in print by Bantam in 1969.
Credible secondary source: Tier B
Lakenheath-Bentwaters incident: The UK's Roswell (opens in new tab)Sky HISTORY (A&E Networks UK)
Source provenance note
Secondary historical overview of the August 1956 Lakenheath/Bentwaters radar-visual case, used for general framing and context. No publish date or byline is shown on the page. The evidentiary basis for this incident record rests on the Condon Report's Case 2 analysis, not this article.