PROJECT BLUE BOOK

PROJECT 10073 RECORD
1. DATE  TIME GROUP 2. LOCATION
5 August 65 06/04042 5 August 65 06/04042 Chicago, Illinois Area
3. SOURCE 10. CONCLUSION 10. CONCLUSION
Military Military BALLOON
4. s. NUMBER OF OBJECTS NUMBER OF OBJECTS
Two Radar analysits evaluate most likely cause as Balloon. Radar analysits evaluate most likely cause as Balloon.
5. LENGTH OF OBSERVATION 11. BRIEF SUMMARY AND ANALYSIS
45 Minutes Two objects. Was first noticed when picked up on Ground-Rada
6. TYPE OF OBSERVATION at approx loo thousand ft. Slow movement. Appeared and
disappeared on scope with no constant heading.
Ground-Radar
7. COURSE
Manuvered
PHOTOS
C Yes
MXNo
9. PHYSICAL EVIDENCE
07 Yes
No
FORM
FTD SEP 63 O-329 (TDE) Previous ditions of this form may bo used.
:

Memo, TDEw, 2 Sep 65, Request for Radar Analysis, 6 Aug 65, Louisville,
Ky & Chicago, Il1
1st Ind. (TDEED/Capt Dunlap/pkj/74236) 8 Sep 65
TO: TDEw (Major Quintanilla)
1. The information contained in this report is insufficient to make a
creditable radar analysis.
2. Although the message indicates the objects were characterized by
slow movement, those first sited at 294ON, 870ow traveled to 4007N,
8624w before being lost. This means the objects moved about 620 NM
in 45 minutes, a speed which could be viewed as other than slow mindtes, a speed wnich uld be.viewed as ocner tnan slow
movement. I movement. Request this possible discrepancy be reviewed. Request this pe possible discrepancy be reviewed.
3. Since the objects were reported by two distant radar stations, 3. Since the objects were reported by two distant radar stations,
anomalous propagation can probably be ruled out as the cause. However,
clarification as to whether or not both stations made observations
simultaneously is needed. Additionally, it could be helpful to know
whether or not a temperature inversion was existent in the area.
4. 4. The altitude and The altitude and described slow movement suggest the possibility described slow movement suggest the possibility
of the objects being balloons. Balloons of certain materials can be
cbserved via radar, and without further information concerning move-
ment and/or speed are the best explanation of the observation.
JOHN W. VEGA
Lt Colonel, USAF
Acting Director
Electronics Directorate

HEADQUARTERS
FOREIGN TECHNOLOGY DIVISION
AIR FORCE SYSTEMS COMMAND
UNITED STATES AIR FORCE
WRIGHT-PATTERSON AIR FORCE BASE. OHIO
REPLY TO
ATIN OF: TDEW 2 Sep 65
SUBJECT: Request for Radar Analysis, 6 Aug 65, Louisville, Ky & Chicago, Ill
10: TDEAND/Mr Bryant
Reference the attached message from Chicago ADS, Truax Fld,
Wis, cite CHoIn 22o95 6 Aug 65. Request radar analysis be
perforned and conclusions reached made by return first indorse-
ment.
HECTOR QUINTANILLA, Jr 1 Atch
Major, USAF a/s
Chief, Aerial Phenomena Branch
I
A2
YOU. THE NUCLEUS OF SECURITY!

DEPARTMENT OF THE AIR FORCE
HEADQUARTERS CHICAGO AIR DEFENSE SECTOR (ADC)
TRUAX FIELD, WISCONSIN 537O7
ATTN OF: REPLY TO CHODC
2 1 SEP 1965
SUBJECT: UFO Radar Returns, 6 Aug 65, Louisville, Ky & Chicago, Ill
TO: Air Force Systems Command
Foreign Tech Div (TDEW)
Wright-Patterson AFB, Ohio
1. Reference your letter, TDEW, UFO Radar Returns, 6 Aug 65,
Louisville, Ky & Chicago, Ill, dated 14 September l965.
2. The position of the objects when first sited should have
read 3940N, 8700W. The two radar sites concerned did not
maintain continuous radar contact with the objects. Rather,
the objects seemed appear and disappear sporadically.
3. Objects were observed by both radar sites during the
same time period; however, further investigation showed that
the sites were not detecting the same objects.
4. There were no known temperature inversions in the area
at the time of the detections.
NDER
Colonel, USAF
Acting Director of Operations
:

a
1
FOR THE COMMANDER
7
.-
-
S 1
ERIC T de JONCKHEERE i
1 Atch
-
Colonel, UAr
Lst Ind fm TEzD,
Deputy for Technology and Subsystems 8 Sep 65
..
3--
- 2
A.1
i
K -
- Bog -
141 -
5 o at
- -
71 .- - 7
- :
2 .
1 A

CYS
OS RIDM2
UNCLASSIFIED OSA
OSP
US
DEPARTMENT OF THE AIR FORCE RR ,
STAFF MESSAGE BRANCH IL
INCOMING MESSAGE ILA
ILT
ILP
AF IN : 51733 (6 Aug 65) T/rph ILS
ILT
ACTION: NIN-7 TM
RD
INFO SAP-OS-3 (11) MS
MP
S4B C205 ZCHQA868ZCYJX850 MPR
AA
PP RUEAHQ A4A
AAR
DE RUCDAH 31 2 18 1837 DE RUCDAH 31 2 181837 G2
OT
ZNR UUUUU LL
S8 S8
P 061830Z ZEX DSKG
FM HQ CHICAGO ADS TRUAX FLO WIS
TO RUWGALE /ADC TO ADC
RUCDSQ/AIR FORCE SYSTEMS COMMAND FORE IGN TECH DIV WRIGHT PATTERSON AFB
RUEAHQ/HQ USAF WASH D C
RUEAHQ/SECRETARY OF THE AF WASH D C
BT
UNCLAS CHOIN 22095 6 AUGUST 65. FOR 30 AIR DIV
(30-OIND: HQ USAF (AFNIND: SEC OF THE AF (SAFOI): AFSC (FTD).
UFO DETECTED BY TWO RADAR SITES REPORTED TO CHADS 6 ALG
65INVEST IGATION COMPLETED 6 AUG 65. DESCRIPTION OF
OBJECT: NUMBER-TWO GROUPS OF TWO. PERT INENT FEATURES- OBJECT: NLMBER-TWO GROUPS OF TWO. PERT INENT FEATURES-
DETECTED ON RADAR. DESCRIPTION OF COURSE OF OBJECT: DETECTED ON RADAR. DESCRIPTION OF COURSE OF OBJECT:
WHY NOTICED - PICKED UP ON RADAR. POSITION WHEN FIRST WHY NOTICED - PICKED UP ON RADAR. POSITION WHEN FIRST
DETECTED - TWO AT 294GN 870ON AT APPROX 100 THOUSANO FT. DETECTED - TWO AT 294GN 870ON AT APPROX 100 THOUSAND FT.
TWO AT 3849N 8525W AT APPROX 100 THOUSAND FT. P0SITION

2 UNCLASSIFIED
DEPARTMENT OF THE AIR FORCE
STAFF MESSAGE BRANCH
INCOMING MESSAGE
AF IN : 51733 (6 Aug 65) Pg 2 or 3
WHEN CONTACT LOST- TWO AT 4007N 8624W TWO AT 3836N
PAGE 2 RUCDAH 31 UNCLAS
8549W AT APPROX 65 THOUSAND FT. DESCRIPTION OF FLIGHT
PATHS - SLOW MOVEMENT - UNABLE TO OBTA IN SPEED. APPEAR-
ED AND DISARREARED ON SCOPE - NO CONSTANT HEADING. MAN-
NER OF DISAPPEARANCE - LOST RADAR CONTACT. LENGTH OF
OF LOUISVILLEK OBSERVERS - ARL INGTON HGTS RADAR
SITE AND SNOW MOUNTAIN RADAR SITE. WEATHER AND WINDS-
ASW ACCOUNT OF WIND DIRECTION AND VELOCITY, SURFACE-
LIGHT. 6000 FT - 230 DEGREES AT 15 KNOTS. 10,000 FT -
200 DEGREES AT 15 KNOTS. 16,000 FT - 190 DEGREES AT 15 200 DEGREES AT 15 KNOTS. 16, 000 FT - 190 DEGREES AT 15
KNOTS. 20, B00 FT - 190 DEGREES AT 10 KNOTS. 30,000
FT - 230 DEGREES AT 20 KNOTS. 50,000 FT - 290 DEGREES FT - 230 DEGREES AT 20 KNOTS. 50, 000 FT - 290 DEGREES
AT 25 KNOTS. CEIL ING - 25,0O FT. VISIBILITY - 10
MILES. CLOUD COVER - CLEAR. NO THUNDERSTORMS IN AREA.

∴:
UNCLASSIFIED
DEPARTMENT OF THE AIR FORCE
STAFF MESSAGE BRANCH
INCOMING MESSAGE
AF IN : 51733 (6 Aug 65) Pg 3 of 3
NO UNUSUAL ACTIVITY IN THE AREA. INTERCEPT ACTION
TAKEN - NONE. NO KNOWN AIR TRAFF IC IN AREA AT THAT
PAGE 3 RUCDAH 31 UNCLAS
ALTITUDE. PREPARING OFF ICER - INTELL IGENCE OFFICER,
CHICAGO AIR DEFENSE SECTOR. COMMENTS - NONE. PHYSICAL
EVIDENCE - NONE.
BT
-