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

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