DOW-UAP-D017, UAP Reported at Sandia Base, 1948-1950

Investigation reading

This Release 02 item is WAR.GOV/PURSUE manifest row 3, a Department of War PDF titled DOW-UAP-D017, UAP Reported at Sandia Base, 1948-1950. The manifest frames it as a 116-page file of Armed Forces Special Weapons Program and U.S. Air Force documentation related to sightings and investigations near Sandia, New Mexico, from 1948 to 1950. The manifest description says the file contains 209 reported sightings of “green orbs,” “discs,” and “fireballs,” plus contemporary investigation of copper-bearing dust or residue questions. [S1][S2]

The source asset is a scanned, OCR-layered PDF rather than a clean born-digital report. The PDF metadata identifies 116 pages, copy-disabled AES-256 encryption, and one rendered page image per PDF page. Text extraction produced a large OCR layer, but the sightings tables are degraded enough that precise cell-by-cell claims still need manual transcription from the rendered pages. For this draft, analytical wording is therefore bounded to clearly readable pages, source headings, OCR-supported excerpts, and representative rendered-page checks. [S3]

The strongest readable packet begins around the 25 May 1950 Air Force Office of Special Investigations memorandum titled Summary of Observations of Aerial Phenomena in the New Mexico Area, December 1948 - May 1950. That memo says the 17th District OSI began collecting and reporting aerial-phenomena data after a December 1948 liaison meeting determined that the frequency of reports in the New Mexico area warranted an organized reporting plan. It describes the observers as including scientists, OSI special agents, airline pilots, military pilots, Los Alamos security inspectors, military personnel, and other witnesses whose reliability the memo says was not questioned. [S3]

What the released item appears to contain

This is a dossier, not a single event file. It mixes correspondence, technical dust-collection notes, military/security memoranda, tabular sighting summaries, a photographic page, an analytical letter by Lincoln LaPaz, and supporting overlays or exhibits. The visible source record is most useful when treated as a bundle of linked source layers: manifest description, Air Force/OSI summary, LaPaz green-fireball analysis, Crozier/Seely dust-collection work, the Datil photograph page, and later included sighting exhibits.

The 25 May 1950 OSI memo says the attached compilation covers aerial-phenomena sightings mostly in New Mexico after December 1948 and classifies each sighting into one of three categories: green fireball phenomenon, disc or variation, and probably meteoric. The same memo says Los Alamos conferences were held on 17 February 1949 and 14 October 1949 with representatives from military, AEC, FBI, University of New Mexico, Air Force Scientific Advisory Board, Air Materiel Command, and OSI channels. Its own cautious conclusion is that no logical explanation had been proffered for the origin of the green fireballs, that the phenomena should be studied scientifically until satisfactorily explained, and that continued occurrence near sensitive installations was a cause for concern. [S3]

A multi-page sightings table spans the core of the file. Rendered page review confirms a Summary of Sightings of Unidentified Aerial Phenomena table with columns for date, time, number of objects, observer reliability, location, course, altitude, motion, color, trail/exhaust, duration, sound, shape, apparent size, apparent speed, disappearance, and evaluation. The manifest states 209 sightings; the OCR table visibly reaches sighting numbers in the 200s, but exact row-level transcription should be treated as future work because the table cells are small, aged, and noisy in text extraction. [S2][S3]

One page is explicitly labeled Sighting No. 175 and contains an embedded dark photographic reproduction, not just text about a photograph. The caption describes it as a Photograph of Unknown Aerial Phenomena taken at Datil, New Mexico by Cpl. Lertis E. Stanfield of Holloman Air Force Base on 24 and 25 February 1950. The typed analysis attributed to Dr. Lincoln LaPaz says the luminous object’s angular diameter was about one quarter of a degree and its angular velocity was greater than half a degree per minute; LaPaz then argues it was not the Moon, Venus or another planet, or a bright fixed star slightly out of focus. This remains a source claim inside the released PDF, not an Open Sky finding about the object. [S3]

The file also includes University of New Mexico / Institute of Meteoritics material from LaPaz. In the 23 May 1950 Anomalous Luminous Phenomena (Seventh Report), LaPaz lists differences he saw between reported bright green horizontally moving fireballs and ordinary meteors, including path geometry, low apparent height, velocity, lack of sound, vivid green color, and duration. He states that 72 objects had been accepted as belonging in the green-fireball category, while also treating possible meteorite falls, U.S. guided missiles, and more speculative missile interpretations as competing source-era hypotheses. Those hypotheses should be preserved as historical analytic claims, not promoted into present-day conclusions. [S3]

The copper/dust material is more cautious than the manifest blurb alone might suggest. The Crozier/Seely report describes an attempt to collect airborne particles after the 24 July 1949 fireball and the use of rubeanic acid methods to identify copper or copper compounds. It reports copper-bearing particles in some collections but says it would be very hazardous to draw a definite association with the fireball. A 10 August 1949 letter similarly concludes that no widespread significant dispersion of copper-bearing particles was shown and that one heavy copper collection should be presumed local until contrary evidence is found. LaPaz, in a separate response, argues that if future work did connect copper particles to green fireballs, that would matter greatly, but he also acknowledges that the work so far was negative or at best inconclusive. [S3]

Source asset review

The reviewed source asset is the official Release 02 document-bundle PDF entry for DOW-UAP-D017_General_Correspondence_Of_Sandia.pdf. The extracted PDF is 68,764,801 bytes with SHA-256 ec72132902a2f50d2ab032031386710fef1d1ae1face0226a90243f61d9347b4. The release document ZIP has SHA-256 8200c60f179767f50f5e6d0bf8373dfef7220326728610241394bcb8de22272d; this PDF entry is 68,764,801 bytes uncompressed, 68,706,733 bytes compressed, with CRC32 e98da1e2. [S3][S4]

Representative rendered-page checks were performed for the opening correspondence/security material, the 25 May 1950 OSI summary memo, the sightings-table pages, the Datil photograph page, the LaPaz anomalous-luminous-phenomena report, and a Camp Hood overlay page. Those checks support the page-level inventory above: this PDF includes readable typed pages, degraded tabular pages, at least one embedded photographic reproduction, and map/overlay-style exhibits. It does not provide raw sensor data, modern metadata, or a clean machine-readable sightings database.

The direct official PDF URL is preserved in this page. For source review, the verified bytes came from the official Release 02 document bundle because the direct PDF endpoint did not return the file to the unattended range/HEAD probe used here. That direct-access behavior is a custody/access note, not evidence against the official manifest row.

Source custody and provenance

Primary provenance is the official WAR.GOV/PURSUE Release 02 landing page and manifest row 3. The row identifies the item as Department of War, Release 02, release date 5/22/26, kind PDF, incident date 1948-1950, incident location New Mexico, and official PDF URL https://www.war.gov/medialink/ufo/052226/release_02/documents/DOW-UAP-D017_General_Correspondence_Of_Sandia.pdf. [S1][S2]

The same manifest row gives the release thumbnail and VIRIN 260508-D-D0360-1053. The reviewed PDF bytes are tied to the official document ZIP entry named DOW-UAP-D017_General_Correspondence_Of_Sandia.pdf; the entry size, CRC32, and SHA-256 are recorded above to keep the public source path auditable. [S2][S4]

No DVIDS media page is attached to this row. Unlike the Release 02 video and audio records, this item should be modeled as a WAR.GOV document/PDF source record with an extracted text layer and rendered page images.

Graph context

The current Open Sky graph probe returned no exact graph records for this Release 02 slug, title, PDF URL, or dataset row. It also returned no Release 02 dataset label counts for this worker context. That absence is not evidence against the document; it means this page is operating from official WAR.GOV manifest and source-asset provenance until Release 02 graph ingest catches up.

No graph-derived finding is made here. Future graph integration should separate the source document, the OSI summary memo, individual tabulated sightings, the Datil photograph page, LaPaz analytic claims, Crozier/Seely dust-collection claims, and map/overlay exhibits. Any title-related or historical green-fireball records already in the graph should be treated as leads unless they are explicitly tied back to this exact Release 02 row, PDF URL, or source-file hash.

Leads to check

• Transcribe the sightings table into a structured, citation-safe dataset. The manifest says 209 sightings; the rendered table appears to reach the 200s, but OCR is not reliable enough for automated row claims without manual table review.
• Split the dossier into source-level subrecords: OSI May 1950 summary, LaPaz seventh report, Crozier/Seely copper-dust reports, Sighting No. 175 / Datil photograph, Camp Hood overlay, Los Alamos conference notes, and Sandia/AFSWP correspondence.
• Cross-check the source-era references to Project Grudge, Land-Air/Holloman study work, Los Alamos conferences, and Air Materiel Command distribution against existing Project Grudge, Project Twinkle, Air Force, FBI, AEC, and University of New Mexico holdings.
• For the Datil photograph page, seek a higher-quality source image or companion analysis before making any claim about the photographed feature beyond the typed source caption and LaPaz’s stated exclusions.
• Treat copper-particle material as an unresolved/inconclusive source lane. The strongest next checks are sampling methods, local contamination controls, meteor/fireball chemistry, and whether any later official or scientific files resolved the Crozier/LaPaz disagreement.
• Build prosaic-correlation lanes for the source-era sightings before escalation: meteor/fireball activity, aircraft and missile testing, White Sands/Holloman/Kirtland operations, observer geometry, weather, astronomical objects, and reporting-network bias.

Limits

This page is a source-review draft, not a finding. It does not conclude that the Sandia-area reports were anomalous, non-human, missile-related, meteoric, or misidentified. It preserves what the released file appears to contain and highlights where the source itself is uncertain, speculative, or technically limited.

The PDF is a scanned historical packet with OCR noise, copy restrictions, aged type, small tables, and degraded exhibits. The text layer is useful for navigation and quotation triage, but it is not sufficient for exact table transcription or final analytical claims. Rendered page checks confirm key document types and source claims, but they are not a substitute for a full page-by-page human archival review.

The file contains source-era Cold War speculation about meteors, guided missiles, possible foreign launch interpretations, and U.S. testing. Those passages belong in provenance-aware historical context. They should not be flattened into modern certainty or public hype.

Sources

• [S1] WAR.GOV/PURSUE Release 02 landing page: https://www.war.gov/UFO/
• [S2] WAR.GOV Release 02 manifest CSV, row 3, DOW-UAP-D017, UAP Reported at Sandia Base, 1948-1950: https://www.war.gov/Portals/1/Interactive/2026/UFO/uap-data.csv
• [S3] Official PDF URL, DOW-UAP-D017_General_Correspondence_Of_Sandia.pdf: https://www.war.gov/medialink/ufo/052226/release_02/documents/DOW-UAP-D017_General_Correspondence_Of_Sandia.pdf
• [S4] Official Release 02 document ZIP bundle containing the verified PDF entry: https://www.war.gov/medialink/ufo/052226/release_02/release_02_document_bundle.zip