# May 1, 1952 — Tucson, AZ — The Case of the Missing Report

**URL:** https://uapdiscovery.discourse.group/t/may-1-1952-tucson-az-the-case-of-the-missing-report/576
**Category:** Blue Book Unknowns
**Created:** [April 30, 2026, 10:03pm UTC](https://uapdiscovery.discourse.group/t/may-1-1952-tucson-az-the-case-of-the-missing-report/576 "2026-04-30T22:03:37Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![jeffknox](https://avatars.discourse-cdn.com/v4/letter/j/e47c2d/32.png) [@jeffknox](https://uapdiscovery.discourse.group/u/jeffknox)
#### Post date: [April 30, 2026, 10:03pm UTC](https://uapdiscovery.discourse.group/t/may-1-1952-tucson-az-the-case-of-the-missing-report/576/1 "2026-04-30T22:03:37Z")

</div>

![05011952-TucsonAZ-BB-Sketch](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/7/7fed64af3681bfaedd11b697a3beafb3a0debac3.jpeg)

May 1, 1952 — Tucson, AZ  
9:10 a.m. Air intelligence officer Maj. Rudolph Pestalozzi and an airman standing outside the Davis-Monthan AFB base hospital, Tucson, Arizona, watch two shiny, round objects overtake a B-36 flying above. The objects slow down to match the plane’s speed and remain in formation with them for 20 seconds.

 ![05011952-TucsonAZ-BB-SightingMapDrawing](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/c/ca3894598dc470af550e88bab9d6452ff3a10cc7.jpeg)

Then they make a sharp, no-radius turn away from the B-36, moving away a bit. Then one of the objects stops and hovers. Both are silent, and the crew estimates they have a diameter of 20–25 feet and a thickness of 10–12 feet. [Eberhart]

Record Card:

 ![05011952-TucsonAZ-BBCard](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/7/7da5bf3f9a304d962404d2f907adeb9325bdc4c0.jpeg)

Blue Book Air Intelligence Information Report:

 ![05011952-TucsonAZ-BB-AirIntelReport-1](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/5/53aea3acb7e525510345e02867532811ffedd4d1.jpeg)

 ![05011952-TucsonAZ-BB-AirIntelReport-2](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/d/dc89738962a9b7a0b0aa10f1f24b8d6949dfcbac.jpeg)

Pestalozzi’s Letter to Dr. James E. McDonald:

 ![05011952-TucsonAZ-BB-PestalozziLetterToJEM-1](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/b/b1c732fd1ec289b2d8dfafff6ddfa4984346a6bd.jpeg)

 ![05011952-TucsonAZ-BB-PestalozziLetterToJEM-2](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/3/3ec1849ccf1e3c0de8dd307bf4fcae2e31e58e6a.jpeg)

Sources:  
J Allen Hynek, The Hynek UFO Report, pp. 109–112, 292–294;

 ![05011952-TucsonAZ-HynekTUR-p109](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/c/c187548adf8cad1e53454e985703f3a08c279669.jpeg)

 ![05011952-TucsonAZ-HynekTUR-p110](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/8/867d0b5477fad8425872fee5992f44cb5efcc459.jpeg)

 ![05011952-TucsonAZ-HynekTUR-p111](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/f/fa0aefba2c5223a7b696be4627bf11f0732db610.jpeg)

 ![05011952-TucsonAZ-HynekTUR-p112](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/f/f6e5b0577fb69f9d69b4b807f0564b2afe6ac2f6.jpeg)

 ![05011952-TucsonAZ-HynekTUR-p292](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/6/6c963478660e5df0acabba42d3dd303dc530938c.jpeg)

 ![05011952-TucsonAZ-HynekTUR-p293](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/3/35d341b95874dd72c97a677a3b151940204a1200.jpeg)

 ![Uploading: 05011952-TucsonAZ-HynekTUR-p294.png…](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/b/b7dd2d3f21d924f0a8aceae1ec8fffc797d73852.jpeg)

Brad Sparks, Blue Books Unknowns Catalogue, Case 567, p. 131;

 ![05011952-TucsonAZ-Sparks-Case567-p131](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/0/08a65a423106ad937d366cb3a55b8b4089935de4.png)

Richard Hall, The UFO Evidence, Volume II, pp. 73–74;

 ![05011952-TucsonAZ-UFOEv2-pp73-74](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/3/35b20df1e931ce8e42e9800aed319e10c639ef54.jpeg)

Timothy Good, Need to Know, pp. 166–167;

 ![05011952-TucsonAZ-GoodNTK-p166](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/c/c8028e55712958aa3b8099cbfd25d1dd9921f78f.jpeg)

 ![05011952-TucsonAZ-GoodNTK-p167](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/b/b949c34e517eca922e92fb18ca5251f638209610.jpeg)

NICAP, “The Case of the Missing Report”;

 ![05011952-TucsonAZ-NICAPWebsite](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/f/f04df14b52230a9682725ebd754284ceaa3a17d3.png)

> **[UFO Report](http://www.nicap.org/520501davismonthan_dir.htm)**