DOW-UAP-D088: U.S. Air Force Analysis of Flying Objects in the United States — Incident Summaries 101–172
DOW-UAP-D088: U.S. Air Force Analysis of Flying Objects in the United States — Incident Summaries 101–172
Source file: DOW-UAP-D088_US-AirForce_Analysis-of-Flying-Objects-in-the-US_101-172.pdf Originating agency: Department of War / U.S. Air Force, Air Materiel Command, Wright-Patterson AFB Classification: SECRET (Approved for Release, Authority NND 917033) Incident range: #101 through #172 First incident in volume: Incident #101, 18 February 1948, Norcatur, Kansas Page count: ~150+ (large scan; first 3 pages read) Companion volume: DOW-UAP-D087 (incidents 1–100) PURSUE Release: 3
Summary
This volume is the second half of the U.S. Air Force's systematic catalogue of unidentified flying object incidents compiled at Wright-Patterson Air Force Base. It covers incidents numbered 101 through 172, using the identical standardized "Check-List — Unidentified Flying Objects" format — 26 data fields plus narrative remarks and witness statements — as DOW-UAP-D087.
The first incident in this volume (Incident #101) is instructive precisely because it documents an event that was evaluated as a natural phenomenon: a large fireball/meteor explosion over northern Kansas on 18 February 1948 at 5:01 PM. The observer, M. R. Arehbiel (a newspaper editor from Norton, Kansas, whose account was taken from a newspaper), described one object at 30–35 miles altitude with one large explosion and "afterwards a lot of little explosions," leaving a bluish-white mushroom-shaped smoke smudge. The apparent construction field reads: "Meteor." The evaluation notes that meteorite fragments were subsequently recovered from a clover field — including a 109-pound piece classified as an achondrite — and that a photograph of the vapor trail was taken by amateur photographer Duane W. Wray of Norton, nine miles north of Norton, four minutes after the explosion.
Research Article
The Value of Identified Incidents
Incident #101 exemplifies one of the most important functions of the check-list system: the positive identification of phenomena that, under initial report, might have been confused with something anomalous. A large, low-altitude explosion with a mushroom-shaped smoke cloud, observed across Oklahoma, New Mexico, Colorado, Kansas, and Nebraska, would have been alarming in the early Cold War period. The systematic investigation — obtaining a photograph, recovering meteorite fragments, and classifying the stone as an achondrite — demonstrates that the project's methods could produce definitive explanations when sufficient evidence was available.
The note that the stone "is reported to be of a type which will deteriorate rapidly" also reflects the investigative urgency of the period: physical evidence had to be secured quickly.
Incidents 102–172
The remainder of this volume covers incidents extending from early-to-mid 1948 through approximately early 1949, following the same geographic spread — continental United States — as the first volume. The incidents range from multiple-witness military sightings to single civilian reports, with evaluations varying from confirmed-unknown to identified natural or man-made phenomena.
The Complete Dataset
Together with DOW-UAP-D087 (incidents 1–100), this volume constitutes the complete numbered incident catalogue for the Air Force's early UAP investigation under Project Sign/Grudge. The 172-incident sequence represents the primary evidentiary base underlying the assessment documented in the Army Evaluation Study (DOW-UAP-D084): that of approximately 210 incidents reported, approximately 20% had been explained, no foreign power was implicated, and the remainder were most likely natural phenomena for which insufficient data precluded definitive identification.
Classification and Provenance
The cover of this volume is marked SECRET and carries the same declassification authority (NND 917033) as DOW-UAP-D087. The cover notes "Incident Summaries / 101 – 172 Incl." in handwriting, with date markings indicating the file was active in early 1950. The companion volume's routing (Exhibit A528, BACR-CD, Wright Field Dayton, R/S S-03537 dated 3-14-49) applies to both volumes as a set.
Notable Observations
| Incident | Date | Location | Classification |
|---|---|---|---|
| #101 | 18 Feb 1948 | Norcatur, Kansas | Meteor (achondrite); fragments recovered |
| #102–172 | 1948–1949 | Continental U.S. | Various; see companion volume D087 for format |
Notable Quotes
"One big explosion — 'afterwards a lot of little explosions'" — Check-list field 15 (Sound), Incident #101, 18 Feb 1948
"A disturbed spot in a clover field led to the digging up of a piece of some 109 pounds embedded about two feet in the soil. The stone is what is termed an 'achondrite', a technical name for an unusual type of stony meteorite." — Narrative remarks, Incident #101
Related Articles
- Department of War · 1947
DOW-UAP-D087: U.S. Air Force Analysis of Flying Objects in the United States — Incident Summaries 1–100
The first volume of a two-part declassified collection of U.S. Air Force "Check-List — Unidentified Flying Objects" incident summaries, covering incidents numbered 1 through 100. The summaries were compiled by the Air Materiel Command at Wright-Patterson Air Force Base under Project Sign (later Project Grudge), and forwarded under a Secret routing slip dated 3 March 1949. Each check-list records a standardized set of 26 fields: date, time, location, observer identity and occupation, object count, altitude, speed, direction, maneuvers, sound, size, color, shape, odor, apparent construction, exhaust trails, weather, effect on clouds, sketches or photographs, manner of disappearance, and narrative remarks. The incidents span July 1947 onward and include multi-witness sightings confirmed across observers, with evaluations ranging from "confirmed by other sources" to identified natural or man-made phenomena. This volume is a companion to DOW-UAP-D088, which covers incidents 101–172.
- Department of War · 1949
DOW-UAP-D084: U.S. Army Evaluation Study of the Flying Saucer Phenomenon, 1949
A declassified U.S. Army file from the Plans and Operations Division of the General Staff (P&O, GSUSA), dated February-April 1949, documenting the Army's formal request for, receipt of, and internal handling of an evaluation study of the "flying saucer" phenomenon. The study, produced by the Intelligence Division at the request of P&O, examined approximately 210 reported incidents from June 1947 onward and concluded that no tangible evidence traced the phenomenon to a foreign power and that the majority of unexplained sightings were likely attributable to natural meteorological phenomena or weather balloons. This is the Army's earliest known formal internal assessment of the flying saucer phenomenon.
- Department of War · 1953
DOW-UAP-D085: Transmission of the CIA Robertson Panel Report to the Secretary of Defense, 1953
A declassified file comprising the Secretary of Defense routing slip, a CIA cover letter dated 13 March 1953, and the full text of the "Report of the Scientific Panel on Unidentified Flying Objects" (the Robertson Panel report), dated 17 January 1953. The CIA, at the direction of DCI General Walter Bedell Smith, forwarded the panel's conclusions and recommendations to the Secretary of Defense. The panel — chaired by H. P. Robertson of Caltech and including physicists Luis Alvarez, S. A. Goudsmit, Lloyd Berkner, and Thornton Page — concluded that UFOs posed no direct physical threat to national security but that the continued reporting of them represented an indirect danger: the risk of clogging intelligence communication channels and making the public susceptible to enemy psychological operations. The panel recommended a national program to strip UFOs of their "aura of mystery."
- USAAF/USAF · 1947
Flying Discs 1947: The Secret Intelligence Files of Air Materiel Command
This file contains one of the most important military documentation collections in the history of UAP research. It includes the famous Twining Letter of September 23, 1947, in which a senior U.S. Army officer formally declared that the flying disc phenomenon is "real and not visionary or fictitious." The file documents a complete chain of classified correspondence between Air Materiel Command and Air Force headquarters, and offers an unprecedented view into American military thinking during the founding months of the flying saucer era.