PROJECT BLUE BOOK

PROJECT 10073 RECORD CARD 1
LOCATION 2. CONCLUSI
? Chieags, Illinsic Was daio-
000 Frobabivbooon
DAT: TYPE CF OSSERVATION Posshlv 10005
∴.0 5 Groond-Vrsual Groung-Rador Wns Arratt
nc Probanly Arcrot
GNT BA.V.u C Allntercept Raiy Possiolv Arctut
5. PMTTUS 6. SOURCE Was Astranmca
?. Probeblv Astronsnics. C1C6
Nadar CCA Nadar CCA Possialy Astroromical Astruremical
?. .. LENOTH OF CBSPR\ATION LENOTH OF CBSFRIATION 6. 9. COURSE Cthe- Cthe-
Inssiticient Data tor Evaluation Inssiticient Date tor Evaluation
S MArS Unk nown Unknewn
HLtBLe
10. BRIEF SUMMARY OF SICMTING BRIEF SUMMARY OF SIGNTING 11. COMMENTS
I1 Lrratie" ishewvers. Liratie" ihewvers. Ho invorsion layer gresent, Jut nols a. He Lnversion layor gresent, Jut nols ar
Lapse rate'is eraatie and erild pevel. rate'is errutie and erild peost.
cause cuch rodar roturne. Clan& 1. cuch rodar roturne. Clane 1.
torgoe torgee ctality vould tend to cubg al. t ctelity vould tend to subg al. t
this. this.
' ,
ATIC FORM J29 (REV 26 SEP S2) 1
.

(
INTENSE OCCURRED NOISE
TEMER TGTS PD
WX I SEP ALL CDST .
1830 (EST) 2500 BROKE 8000B 20000B IS MILES SE DEG S6DP WNW4
1930 " 2590 B -
20059 0/C ---- 15 58 53 WNWS
203% 2509 SCAT 7560B 20009 0/C 15 RW MINUS INUS58DEG55DP (
WW is CONT. FROM LAST LINE
15 RW 58 5 54 Vi0
2230 - 15 57 54 W7 RAIN ENDED (
2339 : 9000 15 57 5 56 NW 6 W
N (
02 SEPT.
7030 ii 6900 B 20099 O/C 12 57 54 WNW 15
0130 .5 : 14000 B 12 12 56 53 NW 13 56 53 N0 13
0230 0230 " W -10090 -10090 12 54 51 VMW 8 VNW 8
0335 0339 :8 5005 B ii 5005 B 100 0/0 0/ - 12 54 51 : 54 51 A NV 6 NW 6
0430 = 2500 0/C --- 2500 0/C --- .. 12 53 51 V7 53 51 W7
9530 " = 4090 B -- -- 12 54 51 WNU 9 54 51 WNW 9 -
9630 F 4009 B 4000 B -•• ••• *- -- 15 55 5 51 U9 51 V 9 ( (
i ... ....
. -
-
PACE THREE JEDPK 002 -
-
9730 = 4000 S --- -*** 15 57 50 V 12
7835 = CLEAR --* .. 15 59 48 WNV 15 (
C930 = 2523 S --- .. •• 15 63 47 W 13
ISOTHERMAL SUZS TO 1DBOO CMA SMOOTH ON UP PD INCREASING MOISTURE FROM
SESS TO SEOS RAPID DRYING ABOVE SOSS PD MIDWAY TOVERS DETAILED REPORT
WILL BE FORUARDED BY MAIL PD
11/0353Z SEPT JEDPK

2 Jets Pierce
Radar "Spot"
At Chicago
CHICAGO, Sept. 2-(CTPS)-
Two Sahre jet fighter planes from
the 4706th i interceptor wing at
O'Hare International airport early
today flew "right through the spot
in the sky over Chicago where
radar scopes on the ground were
showing a reflection from some
, unexplained object." unexplained object."
This was the first This was the first time so far
as is publicly known that an Air as is publiely known that an Air
Force interceptor actually tracked Force interceptor actually tracked
down and rode "through" rode "through" what what
some observers have said have said were were
mysterious extra-terrestial flying
craft.
"We didn't see anything. anything. We .We
didn't hit anything. We anything. We went
through the target showing on the
scope and there was nothing there
-not even cloud," the two -not even cloud," the two pilots,
Capt. William Capt. William W. Maitland and
Lt. Beverly L. Dunjill, told Lt. Beverly L. Dunjill, told their
wing intelligence crews during a wing intelligence crews during a
de-briefing. de-briefing.
The mystery of what was pro-
viding the electronic energy re-
flection, which was picked up on
the radar scopes in the air traffic
control tower at Midway Field,
thus remained unsolved. Bob Zeig-
ler, chief of the Civil I Aeronautics
administration tower crews, told
reporters that t it now is belleved
that some peculiar atmospheric
condition caused the "targets"
which his night crews watched for
several hours between midnight
Monday and 7 a.m. today.
For a time the unexplained
radar reflections had the Midway
civil tower operators considerably
concerned. These crews, experi-
enced in interpreting radar scopes
and aware that there are always
certain shadows and peculiar re-
flections and returns" from the
radar energy output, nevertheless
decided that the blips they were
seeing could only come from some
tangible object moving in the
skies, they reported to Zeigler.

.
roport d, alti taude, a
Chieago a a from 1s00 cloud
Lata is
tlon of similar reports.
lue Book.
COOR.INATION:
SECURITY CLASSIFICATION PAGE 1oF I PAGES
HNPLASSEIED
DRAFTER's NAME (and signature, whem required) RELEASING OFFICER'S SIGNATURE
CAPT E. J. RUPPALI/VS
SYMBOL TELEPHONE OFFICIAL TITLE. SnAG D. MMnDh, k
ATIA-5 51132 ALR ALJUTANT GEHESLAL
DD  173 REPLACES NME FORM 173. 1 FAY 4 -SU2-3  U.. GOVERNNENT PRINTING OFFICE
WHICH MAY BE USEO.

-1
PLOJECT 1SC73 RECORD
1. LOSATION
1
|10. CONCLUSION
PROBABLS SALSLLITES
A OF OBJECTS
1
OBSERVATION 11. BRIEF SUMMARY AND ANALYSIS
1PE CF OSSERVATION
visual The otserved sighted a moving star-like object (light)cn The otserved sighted a moving star-like object (light)cn
several nights. several nights.
C.REE CORSE
0. 27 2 TOs
no No
1. PHYSICAL rHYSICAL EVIDENCE
Tes
-
6) (-229 (TDE) 0. 6-209 (TDE) Previous editions cf thin form may bo uaed. Previoua editions cf thim form may bo uaed.
.
.
1

. 1
- Aus-2,1968
Gopiet Bhe book.
in Chicaga But d cm in lvin daher
wiesconsin Two mere wecke.
wedd on tuy 28ch.l8 18 Juty 31.68
we sien a ebject si eize stoe
andd inewing fot 70 cannd N0 eater
furt gloweng lahte Zls wather conditione
je She clape f dighting were eghihywindy
Monday 2i was maiding But we atil
daw daw it it the Zhe epnd uf ipice 2Le 222 alyict war elyrct was
alont 10 7015 rude 10 7015 mude 24e 2he time of tine of shochay shocay
were July 28 - 9.30 pm 9.30 pm
July 29 9.30 pm
suly 30 suly 3c 925 pr 925 prn
Ju1y30 July30 10.00 pm 10.00 pm
sulys1- sulys1 - 10:00 pm 10:00 pm
wen Ji obyect wint aut cand) aur
all wi a lig white 950 pm slaw
cind 1090 clay we o aut at
amd pin

ang 1,1468 Time 10:00 pa
tho aljicte for fram wadother
glawing white rd andhe top
maving jart.
a stn sO fosding
Piilte wì a row et might
he 7inanow tonicht

Aprll 1951
SUMMARY: List inclon
On tale End ofl Septamber 1952, at 0250 CST,
Supervisor at phone number
Hidway Airport Tower, Chieago, Ilinois,
reported appreocimataly forty objeats on their Radar. Speed of
varied bertwreen 120 MPH and the objeats
150 MPH, altitude 3,000 to 000 Leet, bearing
300 .
Aireraft flying in the vieinity of Midvay Airport reported
uznustal. Two F-&6e based at O'fare nothing
Air Foroe Ense, Chiongo, Illinois were
diverted from Aip Patrol by Captain Robert Campbell,
the 755th ACAW Duty Controller, at
Equndron, Williams Bay, Wisconsin, to investigate the
The twe F-86s The twe F-86s searobed searobed the ares the ares with negative negative wiseoisih, to Divestlgate the objects, objects.
ron had no reaults, The 755th The 755th ACON CON Squad- Squad
ron had no Radar contact with any of , Rada contact with any of the th objects.
The weather at 0250 CST, 2 weather at O250 CST, 2 Septembe September 1952, in the vicinity vicinity of
mlinois, nlinois, 10,000 10,000 feet ) fest broken of Chicago,
clouis, clouds, visibility visisility twelve (12) miles, milles, wind west wind west
northwest, edght (3) kmots, temparature 54 degrees, dus 54 degrees, due
winds alort surface to 5,00o Loet, surfnce to 5,0oo Loet, point point 51 degrees, degrees,
300 degrees, 20 inots, mots, 5,000 to 9,000
Laot, Laet, 250 degrees, 21 knote, , 21 knote,
TOR SA TOR TR
TranokC il bfa- TrangkC il fa-
FRANK J. RAD FRAN J. IEKINAS
CAPT. USAP
LAELLIOPNCE 7ICER
.
INCLS.
DISTRIBUTION BY ORIGINATORVS AC, Wright Fatterson AB, Attn: NCIs
1 C CO, ADC, Int AFB, Attn: Direotor of Intelligence
1 EADF, Stewart tAB, Attn: Director of Intelligence
a As Division, W1llow Run Airport, Attn: Dir of Intell
NOT& THIS DOCUMENT CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE OF UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE ACT, SO U. S.C.— 123
31 AND 32. AS AMENDED. ITS TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER R TO AN UNAUTHORIZED PERSON-IS PROHIBITED BY LAW.
IT MAY NOT BE REPRODUCED IN WHOLE OR IN PART, BY OTHER THAN UNITED STATES AIR FORCE AGENCIES, EXCEPT BY PERMISSION OF THE DIRECTOR OF
INTELLIGENCE, USAF.
(CLASSIFICATION)

2\
PROJECT 10073 WORKSHEET
I. GENERAL
1. DATE CATION TIHE
Local: 152
2 hot Chriav Zebra:
JND? Yos dNo
Nakod Eyo
1 Binoculars
Toloscope
Theodolito
5. WAS OBJECT OBSERVED BY GROUND RADAR? Yes No
MBy On Sot
By Two Sots
CBy Thras Seta
6.WAS OBJECT OBSERVED FROM THE AIR? Yos
N/C Observed Object
C/Interception Attempted
No Intercept Attomptod
7. WERE AIRCRAFT SCRAMIBLED TO I ITERCEPT? Yes INo
2=A/C c Scrambled
Visual Contact Made
CIMIO C Contact Made
hio Contact Mado
. DID OBJECT CHANGE 8. DID OBJECT CHANGE CTION AT ANY TIME? N AT ANY TILE? Yes ENO ENo
CJNormal CJNormal
ClViolent ClViolent
9.IF 9. IF Blinking Blinking
1 Stondy
1O. LO. GHT HT 111-15 Seconds
1-5 Minutes 11-5 Minutes
lOver 10 Mi.nutes oint. 6h0
11. REPORTI il. REP Number and L'ailing Address) ess sadn spd
l ipot Ph dig i
II. ASTRONOMICAL DATA
NUTED?
No
13. DID OBJECT APPEAR TO ARCH DOWNRARD? IlYes JNo
U. DTD OBJECT HAVE A TAIL? IN Yoa [No
L5. DTD OBJECT APPEAR TO DISINTEGRATE? I'IYes No
16. TIME OF SIGHTING RELATIVE TO SUNRISE SUNSET (Nata From Air Almanac)
CNight
C Day
U Sunrise
(Sunset
III. AIRCRAFT DATA
17. WERE AIRCRAFT NOTED IN AREA? SYes No
One Aireraft
(]Nore Than One Aircraft
18. WAS ANY SOUND HEARD? Yes
Os INo
O. WAS THE OBJECT VIEWED ALOVE LSO ELEVATION? Yes CINo
ATIC Tast Form 334 (13 Aug 52)

IV. BALLOON DATA (
21. WERE BALLOONS RELEASED IN AREA? Yes No
LEASET Minutes
LAUNcA OHTING:
Lighted? Describe
Location Type Launching Agency Yes No Lighting
Pitail USDA
b. Diilnakee " "1
d.
(attach over
V. EVALUATION
SOURCET 22. EPORT:
Excellent Good
Oood Good Fair Fair
Fair Poor
Poor Inau lcient to Evaluate
Unreliable
Extremoly Extremoly Doubtful
Hoax
Was Balloon Was Astronomical
- Probably Balloon 000 Probably Astnomical Astronomical
Possibly Balloon Poesibly A:i..nomical A:i.onomical
Was Airoraft other
Probably Arcraft
Possibly Aircraft Insuf aluation
Unknown
24.
Ranb wole be meful he.
ArIC Tost Form 33 (13 Aug 52)
.

7,000 60,000
8,000 65,000
9,000 70,000
10,000 75,000
12,000 80,000
14,000 85,000
16,000 90,000
20,000 100,000
5. WAS AN INVERSION LAYER NOTED? Yes
(If yes, at what altitude?
6.WERE ANY THUNDERSTORMS NOTED IN AREA? No
(If yes, at what quadrant?
8. VISIBILITY WAS
tenths at feet. LZMILES.
tenths at feet.
TS:
untif 2 2 30 EsT. 2s inens sion misbiate
l2e. snfac Sape eati pinooTh To 6,0r0 fi.
I 10,500f.
Al'IC Test Form 333 (13 Aug 52)

..
HEADQTARTERS
LI7OSTH DEPENSE WING
D'MARE INTERNATIONAL AIRPORT
Perk Ridge, Illinois
Intel 350.07 17 SEP 1952
Trens:ittal of Civil Aeronauties Report
TO: Cornanding Officer
Air Technical Intelli ence Center
Wright Patterson Air Foree Dase
Dayton, Ohio
Transrittod herewith is cete, of Civil
Aeronauties Recort referred 12137
dated 11 Sept 1 dated S - on Plue Took. lbok.
FOR THE COMNANDING OPPICER:
a
04957
1 Incl JACK E, FOX JACE E, FOX
Civil Aeronautics Report Civil Aeronautics Report Capt. USAF
5 Sopt 1052 5 Sopt 10 (in dup) Air Adjutaut Ceneral Air Adjutant General
.

aDDrexO: Bost tar-et
10-:ile rane. The ta anneored to be
on the 3-rile ranrd, Those tareets wore also observed on the PAR scopo
at en oltitudo
on ezimuth snd fair on elevation. They were visible as close in as the
from the
Several o? these tergots were obs rved on redar to e proech within
sinnted he iet the aree at Oóloe, end within
thdrby min:tes of EOS : of She nidentiied ta rets hsd
disoppeored fron the sgope.
of en anldentified netare observed on the se ros.
wei-l

riles,
Ind northwest 7.
-iles,
0526e - Measured a
wind west
northwest 12.
/s! ROPENT O. ZUECLER
Robert O. Ziegler
Chiaf Airnort Traffic Controller
2

TO CO AT ON AFB OHIO
BLUE BOOK AFOIN-ATIAA
A/F CHICAGQ PD FIRST RADAR TGTS APPEARED BETWEEN GZSI-S2SS CDST BUT
NOT DISTENCT UNTIL S30D PD ABOUT FORTY WERE OBSERVED UITH NO PARTICULAR
FLIGHT PATTERN CMA TWO FLEW WING WITH_INCOMING-DCS FRON EAST TO FIELD FAST TO FIELD
BOUNDARY PD OBJECTS OBSVD ON 6TO 1S AND 2E MILE RANGES CMA TOP SPEED
175 MPH AT ALTITUDES OF 200D MSL PD ALL OBSERVATIONS WITH GOOD AZMUTH
AND ELEVATION READINGS OBTAINED BY GIFILLAN ASR AND PAR DASH ONE EQUIP
PD TWO F-8SS CONTROLLED BY MIDWAY TOWER FROM 0555 TO B619 CDST MADE
PASSES. FROM SDS TO 4SSD FEET AND ADOVE O/C VITHOUT VISUAL SIGHTINGS PD
OBJECTS S BRACKETTED AND FLOWN THRU AT SES FEET PD NEG VISUAL SIGHTINGS
(
PAGE TWO JEDPK E02