A package recovered in Thailand entered Project Blue Book in 1965 as an unidentified flying object. Its contents were physical components, not a photograph of a distant light. The eventual identification was unusually specific: the manufacturer linked them to a numbered rocket motor used on a Scout mission carrying Italy’s San Marco satellite.
The seventeen-page case file preserves the path from a provincial recovery to a manufacturer’s answer, including an early wrong stage assignment and a later correction to the reported re-entry year. UKPX assesses the recovered components as Closed (Explained). That classification covers their documented identity; it does not supply an exact fall location, time or witnessed descent missing from the papers.
What the original Thai referral says
The original referral is present on scan page 15. Dated 25 May 1965 and signed by Colonel B. B. Beck of the Joint United States Military Advisory Group to Thailand, it says that the enclosed object was recovered in Sisaket Province. The provincial governor had turned it over to the Royal Thai Air Force. The advisory group requested identification so it could answer the Thai service.
The letter reports that the object had supposedly fallen from the sky, but expressly says that information about sightings or eyewitnesses to the fall was unavailable. It gives no village, field, named finder, impact description or precise time. This contemporary admission should remain alongside the later success in identifying the material. A recovered object and a witnessed aerial encounter are different kinds of evidence.
The date on the Blue Book card is marked as a report date, 25 May. It should not become an invented exact fall date. Later correspondence places the supposed descent approximately in May 1965. The province is the geographical extent supported by the original referral.
From an unknown package to a rocket hypothesis
A handwritten note dated 8 July records the Thailand package arriving and being entered as a UFO. A preliminary examination found standard Army and Navy threads and raised the possibility of a United States rocket component. That was a lead for technical enquiries, rather than a completed identification.
On 9 July, Colonel Eric T. de Jonckheere of the Foreign Technology Division asked the Ballistic Systems Division at Norton Air Force Base to help. His letter said that the recovered object appeared to be part of the ignition mechanism of a US rocket. Both the incoming Thai letter and the object were listed as attachments. The correspondence therefore concerns examination of material being passed between organisations, rather than merely a chain of copied witness stories.
The reply, dated 14 July and signed by Colonel John W. Hiney, reported a critical examination but stopped short of positive identification. Markings suggested a product of the Allegany Ballistics Laboratory. The proposed possibilities were X-254, X-258 or X-259 series solid motors, then described as a Scout third stage. The qualifying language is important: at this point the inspectors had narrowed the possibilities, not established the final motor and mission.
Requests for an answer
A July message from the US command in Thailand asked for progress, stating that the Royal Thai Government wanted information. The Foreign Technology Division replied later that month that markings suggested one of the suspected motor series and that it was contacting the producer for verification. A September follow-up shows that the Thai-side reply was still being withheld pending that final check.
The Foreign Technology Division’s 28 July letter sent the supposed Scout motor mechanism to the laboratory and asked for individual parts to be identified. It also asked whether the equipment belonged to Army or Navy inventory. Those questions reflect an investigation still in progress; they should not be rewritten as evidence that military munitions had already been established as the answer.
An Air Force memorandum of a 5 August telephone conversation records a much more specific lead: the Scout San Marco mission, an Italian partnership and a payload intended to study atmospheric density. The caller also wanted better information about where and when the parts had come down. The memorandum says the rocket body had been expected to descend earlier and burn up, and raises a question about whether the payload was nearby. These are recorded expectations and questions, not a reconstructed trajectory proving the conditions of the Thai recovery.
The manufacturer’s identification
Hercules Powder Company, operating Allegany Ballistics Laboratory, replied on 29 September. The letter identified the returned components as parts of an X258 motor, serial RH-75, manufactured in November 1964 for NASA’s Langley Research Center. It associated that motor with fourth-stage propulsion on Scout vehicle S-137, the San Marco mission. This is the decisive documentary link, more specific than the earlier shortlist of possible motor families.
The manufacturer’s letter also placed the reported re-entry in Sisaket Province. It mistakenly printed approximately May 1964. A separate erratum dated 27 October changed that year to 1965. The correction is part of the identification record, not evidence for a second Thai case. The contemporary file also uses 16 December 1964 for launch, whereas Italy’s official account of San Marco 1 gives 15 December. This review preserves that date difference without inventing an explanation for it.
On 7 October, the Foreign Technology Division forwarded the manufacturer’s analysis to the advisory group in Thailand and thanked the Royal Thai Air Force for making the object available. The Blue Book card records physical evidence returned to the manufacturer and closes the case as a Scout rocket. The stronger basis for accepting that result is the sequence of examination, referral and specific manufacturer identification in the attached correspondence.
What the explanation settles
This case demonstrates why an initial UFO filing is not itself a finding of extraordinary technology. Here, unfamiliar recovered equipment became identifiable when people with access to the relevant manufacturing information examined it. The early third-stage suggestion was superseded by a specific fourth-stage attribution. Treating those two stages of the enquiry as equally final would manufacture a contradiction the documents themselves resolve.
There are still limits. The packet does not provide a complete eyewitness account of the descent or a precise recovery position, and this review has not independently re-examined the components. Its explanation rests on the contemporary manufacturer’s identification and its acceptance by the investigating organisation. The absence of a detailed fall narrative does not, by itself, overturn that identification.
A province reference, not a crash-site pin
The map is a broad Sisaket Province reference, rounded to 14.83, 104.33 from the Getty Thesaurus of Geographic Names record for the province. It represents the named administrative area, not a surveyed impact point or a claim that the parts were found at those coordinates. The papers do not support directions to a field, private property or a current display.
No present public museum location for these components has been verified. The documentary image is the original 25 May referral letter, not a photograph of the recovered parts. Readers can follow the investigation in the complete file: original referral on page 15, technical enquiry and first response on pages 16–17, telephone memorandum on page 6, manufacturer’s identification on pages 11–12 and its correction on page 14.