Releases / 6 / DOW-UAP-D103

Project Blue Book Photo File Relating to Tremonton Film, Utah, 1952

File: DOW-UAP-D103
Type: Document, 5 pages
Agency: Department of War
Date: 7/2/52
Place: Tremonton, Utah
Released: Release 6, September 18, 2026

The government's description

During its investigation of a July 1952 film of an incident reported near Tremonton, Utah, Project Blue Book examined whether the objects recorded on film might have been “pillow balloons.” Project Blue Book was a U.S. Air Force program active from 1952 to 1969 that investigated the nature and origin of unidentified flying objects (UFOs). In December 1952, investigators contacted General Mills, Inc., the only known manufacturer of pillow balloons at the time, to determine whether a balloon release could account for the incident.

The file includes example imagery of pillow balloons supplied by General Mills Research Laboratories. In late December 1952, Project Blue Book personnel, balloon specialists, and representatives from General Mills reviewed the Tremonton footage. The group’s consensus was that the objects closely resembled pillow balloons in flight and behaved consistently with that explanation. One General Mills representative was less convinced, noting that the objects appeared somewhat too bright and seemed to maneuver too rapidly.

The reviewers also questioned previous angular-velocity calculations suggesting that the objects moved at a high rate of speed because those calculations depended on the unverified assumption that the camera operator had held the camera still during filming. Subsequent efforts to identify a pillow-balloon release in the Tremonton area were unsuccessful. The file also considered seabirds as a possible explanation, citing similar films showing seabirds as bright points of light under comparable conditions. Later Air Force assessments favored the seabird attribution.

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The Tremonton film · pages 1, 2

Full text

Text taken from the war.gov PDF. Blacked-out parts of the original stay blank, and pages with no readable words, like photos, are left out. Check anything important against the original.

Page 1

Files 1377 & 1415
July 7, 1952.
Tremonton, Utah
2 photos

NND 923007

Page 2

CPO Delbert c. Newhouse
7 miles north of Tremonton, Utah
1110 MST
2 July 1952
Driving on highway -- Wife noticed objects
Group of objects milling about in rough formation
No reference points by which to estimate speed, distance or size
Size to9small on photo to show detail
P~
~lanation -- "Pillow- ~lloo~ or
Biras
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NND 923007

Page 5

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