DECLASSIFIEDUSAF PROJECT BLUE BOOK · NARA T-1206
UNITED STATES AIR FORCE

PROJECT BLUE BOOK

UNIDENTIFIED FLYING OBJECT CASE FILES · 1947 – 1969
CASE REFERENCE6989160
DATE OF SIGHTINGJuly 1952
REPORTED LOCATIONOSCEALA WISCONSIN
FRAMES39

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Nuwtercars Objects were obser! + on radar sc. :a, 3 GUE
a poriod of one hour “*riveling as varied. oy

sneeds. in Fe5l afe was sesacvlod to the air!
| «OF the purpes? of obsarviny objects. Ub) 2265
i wera voserved from 25,090 fb at an estimaced '
a.. va tude of 425,000 rte

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MEANS 292335@Se SIZE UNDETERMINED. SIZE OF SLIP VARIZDe TOP SPZED $30 MPH
REPORT AND COMPUTATIONS SUGMITTED cY OFFICER CONTROLLERS ON DUTYe AVC
SCRAMSLED FROM AJ9TH FTA INTERCEPTOR SQUADRON. TARGETS APPEARED IN”
GENERAL AREA SURROUNDING ST PAUL@INNEAPOLIS. WEATHER CAVUe

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APFHOVED I Jrine 164

of raday peope showing sise, mmber and sovencnt of targets.

are in twe (2) inelesures.:
1) Inelesure this report, is a series of eight (8) photographs, .
on » shoving eight. (3) individual

eontroller for purpose of -
- Int eves Hinn. Filob.
| ee eae eee mer onmeee tebepes S5COIS end aan
| 2902553, ; et
| 10, LOCATION One (1) Fe5l tyre aircraft was in an area fifty

(50) to = miles south and south southeast of £5/15%~92/33/
| 5.40 Setween the altitudes of 6000 to 10000 feet during the sighting veriod.

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FRAME 004 / 039tesseract-200dpi
AF FORM 112—_PART IT..
APPROVED 1 Jime 194

ATR TSR LLICaNCs INPURSATION REPORT
IP faouncr ‘ N ;
| Sian GEHRY, Osceola, wis. yak °? 352 | |
. 5 Poco 1 oe 2 Pazes |
| 2. Numerous wmidentified flying objects of wmdeter-
f | were sighted by trenic means in the eerly morn |
| ing of 29 | ‘by members of the AC&M Sqe, Osceola, Wiscensin, who
were on duty. - 3 he blips whieh emstituted the sightings wre normal |
with the ) large well defined target(Refermece is mdete —
| Inel #1, this report), speed of this target was 600 Imots as computed on the
cadar seove set fifty (50) nautical mile ranze. The revainder of the
| sightings ware ind3 sightings having mitinle targets, up to ten (10),
| *Dpearing in @ loose cluster cn the radar scope(Reference is made to incl #2,
this revort), speed of these targets was fifty (50) to sixty (40) mcts as
| computed on the radar seope set on the fifty (50 nautical mile rmze. The
| only possible formation noted during the mtire sizhting period was during
Fae bo , Yo oa se :
two (2) oF

ee cacitines covered Wy this rerort were nade by ground ©
| ° ef equiment——aN/CPS-63; Frequsncy——27250'cs to
3CO5Mcs;PR¥=—400PPS; Antenna tilt—for sishting in which tarcet «ms well de
fined blin(Reference is made te Incl A, titis report) antenna tilt ws mine (9)
iogrees, Zor*other sightings(Reference is made to Incl #2, this verort) ontemma
1% ome “ive (5) degrees, All moter readinvs were normal ond ecuipnert was

‘stioning preperly.

+0 ® Ieeaticn of sishting statio is 45/15N~-92/33/5..%. Tarzct
would arpear en the radar seops in a comersal area twenty (20) to thirty
nautical miles southwest to soubh of sighting static: qui octer traveliny

| goutheasé would disaprear from the radar s 4n @ general area thirty (30)
\aite rep niles southsact of sigiting staticn(Referemce is =ede te Inel fl & #2,

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29 July 1952 Osceola, Wisconsin

Numerous unidentified flying objects of undetermined size or shape were sighted by
ground electronic means between 01308 and 0230S (lasting 1 hour) on 29 July 1952 by
members of a radar weit located near Osceola, Wisconsin, who vere on duty. Sise of the
Dlipe which constituted the sightings vere normal with the exception of one large well-
defined target, speed of this target was GOO knots as ccuputed on the radar scope set
om the fifty nautical mile range. The remeinder of the sightings were individual sizht-
ings having waltiple targets, up to ten, appearing in a loose ciuster on the radar scope,
speed of these targets wes fifty to sixty mots as computed on the radar scope set on
the fifty nautical mile renge. The only possible formation noted during the entire
sighting pericd wes during one of two of the sightings which consisted of mitiple
targets when two of three of these targets might possibly have been moving in a loose
formation. All tergete cuddeniy appeared on the radar scope and after having traveled
between thirty and severty nautical miles vould just as suddenly disappear. Targets
414 net appear om the height indiestor due to ancuslous propagation. Targets followed
& gemeral pattern of aeppecriang om the redaer scope SW of the sighting station and pro-
ceeding £ until disappearing. ‘There wes @ continual overlspping of satterns on the
| redag_geopes © new pattern vould have eppeared before the old: pattern vould have
Ci Sappesred , In the sightings which consisted of miltiple targets, with the exception of
possible formation movement, targets progressed across the reder scope, until disaypear-
ing, independently ef each other in regard to treck and heading vith some targets making
. Vuwming course. There ves scme correlation »etween ‘shese +lecronts sizntings and

visual siantings made Dy 4 Dilot who was scrembled in conjunction vith the radar
signtinzs. This ‘correlation >lacéd Soth “ves of sizhtings in “ne same (Tea at che

oe time. ‘ot 2etimated wiant of cb jects be visually eaw as 125.000", Sichtine

aticg ‘ss »oeivlesaily searcoing Sor ooselole imidentifiadia §— io 3) lecw™ 4% Cle
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A

CAS PRT (conta)
of first sighting due to a GOC report of visual sighting of unidentified flying ocdjects. .
One F-51 airereft wes sent to sighting area for purpose of intercepting and/or

identifying unknown targets. Whie-af/e-coourp Pilot did report visually sighting
unidentified flying object but interception and/or identification was not possible.
Tais action cceurred between 01308 and 02558.

Cne F-5] aireraft was in em eres 50 to 70 nautical mime ailes S and SSE of

45/158-92/38-5.4W between the altitudée of 6,000 to 10,000’ during the sighting period.
ATIC Comments:

Report indicates that anomalous propagation wag affecting the radar performance.
This condition would allow deteetion of grownd targets vhich are not cormally detected.
This would not explain movement of targets uless veather conditions vere such that
every terget (ground) wee net detected in sach sweep of the antenna thereby causing
an apparent movement of stationary targets.

A firm enalyeis cmnet be made.

Conelusion:

Unknown
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lL. Series of eight! (8) radar scope:
2. Series of three (3) radar scope

3- One. (1) observers signed narrative

AS ‘Sy

7 Ji etribution by Originator: Slide Sel ea
® | A- D/L Bigs usar OG Che CATIC, ATTRES
| CG AR OG 3let’ ap ce ree 4 Stic ae :

* Thts document contains information national, nse :
States within the neaming of the Baris sph UaSiC cede: joe,
anended. Its tranemtesion or the revelatiog of ite. Ban? Ie oe i
an unauthorized perdgan is prohibited by Iass, Teles fae: Rerion ae Es st

4 somfesion oF The ee nee tian. United: Staten Ate. Fohoe kgasetyell ectanes not ee

voTmlseion of the Dirtstiniatitintell 1 geice, USAF a --sasee eaeeeeien Meteo

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‘PATE tprtim of setae ation te S/S a tet
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‘ . hit “a
AF 1Tqpeta (4) Mey 4) . Xx

- HEADQL ATERS UNITED STA ( 5

ROUTING AND RECORD SHEET ,

SUBJECT: H
FLYORBPT Rpt 8-1-52 . }i

'
Bef |

TO: Air Technical Intelligence Center DATE 9 | f |
_ ATTN: Capt Hardin 3 < 6 MAR 1954+ Ls
COMMENT NO. =

FROM: Directorate’ef Intelligence, DCS/O Lt Col Smith/tjc/71092/AFOIN-XES}

———eee ee eee

1. The attached reports were brought to this office in April 1353, for
information purposes. rit
TY

2. Question: Is it possible to get a new radar) sighting for the "Summary"

from these reports? ;
9

A py @
Wi duith
1 Incl W. K. SMITH
Rpt 8-1-52 "FLYORBPT” Lt Colonel, USAF
w/inels Directorate of Intelligence

TO:. Directorate of Intelligence = DATE ) APR 1954
“> Policy and Management Group
ATTN: Lt Col Smith, AFOIN-X COMMENT NO.
_ ATIAE 5 /Cupt-C oA Harad a/ Jog
FROM: Air Technical Intelligence Center 73147/B1dg263A/Post a29 ACQ,

1. In the reports referreé to, it is believed that no connection actually
exists between ei eual end redar sightings; therefore, they would fall in the same

xo the reder Dcosn cihd logically be expanded with the fol--
ie ag amount of ground clutter on the radar indicator is

ast anos temperature and humidity conditions) weather conditions.
riteargets reported on, puotoe marked "Inclosure 1' most likely are different indi-
vidual stationary targets, The si amplitude of ground targets that are
detected due to temperature inversion and/or moisture lapse may only peint occasion-
ally or at a random rate. When several individual targets ere painting in this
random manner, it.4s quite easy to assume that a particular stationary target has
moved from one location to another). geen ting in wemetanss speed variations from zero
to seversl thousand ‘miles ver hour:.

3. There is no new data that will allow a more complete analysis.

g
| 1 Inel ‘ CLAY gcc / |
QQ eres ;

3 a joal -SSt. Ac |

Air Technical Intell isauoméenter
FRAME 035 / 039tesseract-200dpi
29 July 1952, Osceola, Wisconsin

Report indicates that anomalous propagation was affecting tne
radar performance, Tnis condition would allow detection of ground
targets which are not normally detected. This would not explain
movement of targets unless weatner conditions were such that every
target (ground) was not detected on each sweep of the antenna —-
thereby causing an apparent movement of stationary targsts.

A firm analysis cannot be made.

Weatner datas Temperature vs neight, and moisture lapse vs
height would be of some assistance in analysis.

Sea ret dtd 3F Fuly Se.

13 September 1952
FRAME 036 / 039tesseract-200dpi
4.4 rere iwdé

RA 151

WPG158

Yuix 26

HEDKF 255

PP JEDEN JEDWP JEPHO 335
DE JEDKF @21A

2 2516452 ZNI—
—————

FM CO S7T4TX ACW SQ OSCECLA WIS
TO JEPHQ/D/I INT HO USAF WASHDC
JEDWP/CO ATIC WRIGHT PATTERSON AFB OXIO ATIAA-2C ——

QJEDEN/CG ADC ENT AFB COLO oes: wf

iLas€G CADF KSC MO

Cvd/CG 31ST ADIV FT SNELLING MINN |
RAINS 74 -25-G- 21. FLYORST OBJECTS SIGHTED BOTH
ELECTRONIC AND VISUAL MEANS AT 259122S TO’ 252245S. SIZE UNDETERMINED.
cIZB OF BLIP VARIED. SPEEDS VARIED BETWEEN 14429 KNTS AND 29929 KNTS.
REPORTS AND COMPUTATIONS SUBMITTED BY OFFICER CONTROLLERS AND

AIRMEN © DUTY THIS STATION AND TWO PILOTS AIRSORNE FROM 129TH

‘TR INTERCEPTOR*SQDN, TARGETS GENERALLY APPEARED EAST OF STATION

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STAT! AIRGRAPT SCNTROL AND WARNING, 6. sas o grin
Osceola, Wisconsin < .

7 August 1952

AEELIRAYITZ

At O730Z, 29 July 1952, we the undersimed, began to notice tar
@+3 on our Radar Scopes just cast of the Twin Cities. «e had tilted
the Antenna to 5° just prior te this because of a COC report of an
unusual object. The tarzets which we noted on the scores were \ravel-
ng in a southeast direction at from 50 to es «not 3. fter traveling

bout JO miles in this manner they would fade. there vere up to Ly of

-.@se@ on Lhe scores at one tine. At times ‘it would accear lixe 4 loose
fornation waa being flowm by 4. or three of these. che targets con]=
tinned to appear around the area sbout 5 t>5 13 miles e4sb Lo lormneast

of the Twin Clties for an hour. These targets did not /.y in toe same

track or the same heading. ‘Some were mating turns. The .otenna 5ilt
waa 5° on these sizhtings to eliminate anonymcus fropagation on the
scoces and ciex up the targets.

One lerge target appeared at 135° at a range of 1} »iles. In less
than a ainute it was at 165° at 21 miles. it continued in this manner
for svout 70 miles and faded. At this time we had the ‘ntenna tilted .
to 9°, This target was moving east, traveling over 600 \?H and made a
continuous track, it was a clearly defined blip. No weather of any
cind wes in the area, We were net receiving any electronic interference.

in a/C was seraembled because of these sightings. ‘The interceptor
rilct observed what appeared to be shooting stara or comets with tails
on several cccassions when vectored toward the targets which were on our
scopes. There were so many tarqsts that we had the pilot patrol the
general area east of St. “aul and south of the site of the 674th AC&W
jouadrem. The pilet observed one or two of these objects while doing
this.) ‘He wae at 25,000 feet and thought the things he sew were at
125,000 fest.

ey PW » Rc reeabed iy
: acak PAORSA QS SUDA
Ga.c *o svitarisd bengil atevrouct
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HQ 674TH ACAW SQ.
DATE: 8 AUG
INTTIALS

a

AIR INTELLIGENCE INFORMATION REPORT
Sub ject “TYORRPT

AF FORM 112-—Par? I
approved 1 June 1948

Country USA Report No,

leflerences \ control number, direct

a ** APL Ghd 26 Ay
Summary: (onter concise summary of report. Gives significance in final one

“at i tone ie at lower left. Bagin text of
During normal eperations in the early morning of 29 July 1952 numerous um-
identified flying objects were sighted on the radar indicators of this mit.
Information relative te these wmusual sizhtings is contained in this report.

|
7 The signifisenes ef this report lies in the fact that theee sightings are

igsd ceiver report, ae as ee

electronis sightings made end recorded by ecmpstent personnel.

W/o Arnk
pO WILLARD L. WORD
Ii& Gol, USA?’

Commanding

, 3 Inela.
1, Series ae aight (3) radar scope chotozrsachs
2, ‘erios of three (2) cadar scope chotovranhs
» ine | :9gerVvers ‘i. mea tarrative sat anent

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