# U.S. Air Force, Project Blue Book : Project Blue Book (history of the Air Force UFO projects)

> U.S. Air Force, Project Blue Book, . 3 records on Mysteries Department cite it. Blue Book's own short history of its predecessors: Project Sign…

Source: https://mysteriesdept.com/sources/SRC0DFY3WKAF2FV/project-blue-book-history-of-the-air-force-ufo-projects  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Sources](https://mysteriesdept.com/sources)[Incident 88: the Hackensack disc, 3 August 1947](https://mysteriesdept.com/mysteries/incident-88)U.S. Air Force, Project Blue Book

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# Project Blue Book (history of the Air Force UFO projects)

U.S. Air Force, Project Blue Book, .

**Incident 88: the Hackensack disc, 3 August 1947** Report0

## What it's used for here

Blue Book's own short history of its predecessors: Project Sign inaugurated under AMC in early 1948, renamed Grudge on 16 December 1948; the Sign report of February 1949 covering the first 273 incidents; the Grudge report of August 1949 analysing 244 cases.

## Cited by on this site 3 records

[Incident 88: the Hackensack disc, 3 August 1947](https://mysteriesdept.com/mysteries/incident-88)

The mystery article

MYS

[Project Sign (Air Materiel Command, Technical Intelligence Division)](https://mysteriesdept.com/mysteries/incident-88/organisations/ORG0DFY5YVJ0XCH/project-sign-air-materiel-command-technical-intelligence)

ORG

[Wright Field (Wright-Patterson AFB), Dayton, Ohio](https://mysteriesdept.com/mysteries/incident-88/places/PLC0DFY5MNW027N/wright-field-wright-patterson-afb-dayton-ohio)

PLC

## Cite it

```
U.S. Air Force, Project Blue Book (n.d.). Project Blue Book (history of the Air Force UFO projects). https://www.theblackvault.com/casefiles/wp-content/uploads/2018/01/historyproject.pdf
```

[Find it at theblackvault.com](https://www.theblackvault.com/casefiles/wp-content/uploads/2018/01/historyproject.pdf)

Key

**SRC** 0DFY3WKAF2FV

Kind

Report

Rights

The publisher's

Kept

3 Nov 2026, for editors

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[apollo](https://mysteriesdept.com/u/apollo)

The record

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