PROJECT BLUE BOOK

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:
s
|

2 _1505 MST =e ZX) Ground-Visual
GMAT. sia ii -:>, OD Air Visuol
enone i+ a ;6 SouRcE  ~
, O) Yes
a No

11. DATE } (

OATE-TINME GROUP

PROJECT 10073 RECORD CARD

——— a

2. LOCATION

ewe ees ee

7. LENGTH ©F OBSERVATION ©

7 seconds 1

10. BRIEF SUMMARY OF SIGHTING.

tail.

“A. TYPE OF OBSERVATION

oe

— - —_—s —

Yuma, Arizona

Weather observers

—~-— wer

ey 0

O) Graund-Reder 0

_O Arelntercept Raodor

—=

12. CONCLUSIONS !

OM Wos Balloon
O Probobly Balloon
Possibly Balloon

Was Aircraft
O Probcbly Aircroft
Ci Possibly Aircraft

O Wos Astronomical
1) Probably Astronomical
OM Possibly Astronomical

6. NUMBER OF OBJECTS | 9 COURSE

Flat white color.

Slightly erratic trajectory.
All observers agreed it was too fast to
track with a theodolite.

ATIC FORM 329 (REV 26 SEP 52)

Circular w/shyrt

11, COMMENTS

length.

—— ee ee ee eee —_— —_

Odject sub tended angle

Other xchingaibimeaiies

0D Insufficient Data for Evaluation
M Unknown

| |

ere we -

- eee ome ee

———- +

of +" at arm

Had thin intermittent vapor tra ,l

or tail one to two dlanmeters long.

At Yuna Test Genter, Yuma, Ariszona

17 and 13 Aoril 195.

Weather believed UaVt

No photos

Object sirhted each date

Circular in shane,

=>

flate wiite color

Subtended are of 1/4 in. at arm's length

Zenith to horizon (90°) in 7 seconds

60 degrees???

{ y2° [Se

Course not completely sinooth

Altitude unknown

No sound renorted

Intermittent vapor trail, non-persistent, thin, 2 Ciemseters lone

All observers metsorlogical observers and had never

before

.

anytaing like this

Object tracked on 13 April was too
theodolites with onen sights.

b and too erratic to be tracked with

‘4%

— i

— ~~ ———

PROJECT 10073 RECORD CARD

\ 1. DATE

_—_—_————

2 LOCATION 12. CONCLUSIONS
“18 Apr 52 Yuma, Atizona 0D Wos Bolloon ;
| Se eee rman reerte 0 Probably Balloon
3. DATE-TIME GROUP)” % TYPE OF OBSERVATION O Possibly Golleon
W j
MESS asa 0st van 7 0) Ground-Visuol O Ground-Rador = Probably Airereti
a Pa i 2 O Air Vi sual O Air-Interce pt Roder a Possibly Aircroft
x° ~pHoTOS. . i 6. SOURCE O Was Astronomicol
0 Yes es * 0) Probobly Astronomical
Ae | 2 enlisted meteorologists ES  Peewhdy Avianondest
"J. LENGTH OF OBSERVATION ~~") B®. NUMBER OF OBJECTS | 9% COURSE | {9 Other. r
X) Insufficient Dore for Evoalustion
5-10 seconds 1 |Q Unknown
10. BRIEF SUMMARY OF SIGHTING - a 1. COMMENTS oat ee Cy
Dull white color. Circular. Very erratic.

ATIC FORM 329 (REV 26 SEP 52)

Attempted to track with theodolite,

object too eratic.

|

° ~ ; ~_ ( ‘ ,
UNCLASSIFIED PRi0 i
ci ® Screen ae |
Ri CG 6TH ARMY SAN FRANCTSCO CALIF f ae Zhe mama
TO CG AMC WP AFB OHIO ATTN oa +f: hoes canbe

a

, °
# ’ an)

it 4 {

, oP

ney s “os ~ * myTify: 4 ed ra ’ v ‘aaa le vablicte ae 3
FROM AMGBI 959316 AGHON ; iSaan or i

RECONTROL NO A-1917~e PARA Ac Sucomdenr ronal AIRCRAFT REPTD SIGHTED
ViC YUMA TEST STATION, YUMA, ARIZONA 17 AND 18 APRIL 1952.
PARA B. WEATHER BELIEVED CAVUs PARA C. OBSERVED BY MEMBE

“2S_OF
9575 Tsu, YUME TEST STATIONS { cr lili
CPL mune CPL amity: CP
CE:

CPL
erg wg CPL PFC >
PARA De NO PHOTOS « PARA Ee €1) 1 OBJECT SIGHTED
FACH ATE. “¢2) CIRCULAR. (5)

6 SUBTENDED ARC OF 1/4 INCH ATARM SLENGTH. (4) FLAT-WiHETE.
(5) SPEED FROM ZENIT TO HORIZON APPROX 7 SECONDS.

(G6) 63 DEGREES. (7) COURSE NOT COMPLETELY SMOOTH. (3) ALTITUDE
UNK NOWNe €9) NO.SOUND REPORTED. €19) INTERMITTENT VAPOR TRAIL,
NON-PERSISTENT, THIN, NOT LONGER THAN 2 OBJECT DIAMETERS.
PARA Fe ALL OBSERVERS WERE METEOROLOGICAL OBSERVERS AND STATED
THE OBJECT WAS UNLIKE ANY OBJECT OR PHENOMEN ON

N SEEN PREVIOUSL
OBJECT SIGHTED 13 APRIL WAS MOVING TOO FAST AND TOO

ERRATICALLY
TO BE TRACKED BY THE ODOLITES WITH OPENSIGHTS.
GRADED AT 8 YRAR INTERVALS: t magomenene sen Rees ae ot
71225 “ DECLASEL IBD APT en 12 YRARS. A or. eat PR gee: ieee a
pod Dik SUNIL O main a ea pipe ee Seen oe PA SP
RINTCT ASSIFIED REF AG fe
i) a

HEADQUARTERS SIXTH ARMY

PRESIDIO OF SAN FRANCISCO, CALIFORNIA (
Office of the Assistant Chief of Staff, G2

SUBJECT: Intelligence Spot Roport

TO: Commanding General \
Air Tooanical Intel Ligence Conter
Wright-Patterson Air Force Basa

Dayton, Ohio

le Roference your message APOLIMATIAN~S23E. Forwarded herasith
is copy of detailed report received from Yura Tost Stations

2. A copy of this correspondence was sont to AO of S, G-2, Depart-
mont of the Army and Wostern Air Defouse Fores, Hoemilton Air Fores Pase,

Hauwilton, California.
_ ik Leanne

1. Ltr dtd 25 Apr §2 Colonal, GS
2. Statement AC of S, G-2 | ca

S$. List of rans , Pi

DOWNGRADED AT 2 YRAR INTERVALS:
DECLASSIFIND AVFAR 12 YEARS. _

DOD Dik 6290.10

orm. by a Gime. eho sis 4

Saal

UNCLASSIFIED

HSADQUARTERS °
YUMA "RST STATION
Yunaa, Avisona

AMVAP@ES 350209 25 April 1952

SUBJECT: Invelligenos Spot Report

TOs Commuading General ie
Sixth Aroy .e
Prosidio of San Fransisco, Calivornia
ATEH: OACOfS, Ge?

1. This office is reporting that som individuals of this
installation, on 17 April 1952, at 1505 or 1510 hours, spotted sor
uufamiliar fying objost whilo om a hike alomg the Colorad River,
throes (5) miles south of Yuma Tost Station.

2. This objest appsared to bo flatewhite, with mo shosn, cireular
in uhapa, Flying in a 60 dagros azimuth direstion.

$- Inolosed is a written statement of Lt. ae ps

who was the leader of the group.
FOR TES COMMANDING OFFICER:

/3/ Irving Lama

1 Inol /tf/ IRVONG LAMM
Sta tern’ Ci USA
ASSISTANT ADJUTANT
Copy furnished:
Regional Office 5
Phosnix, Arizona

DOWNGRADED AT 3 YPAR Drrmvar a
DECLASSIC:'D > PPan 12 YEAR
LOL Lik 6200.19

UNCLASSIFIED

ht ase
: . «a
rte ei

( Seek «=UNCLASSIFIED

le On the afternoon of 17 : 952.tie.underaigned took « group of
Enlisted Weather Observors on W Field f dovization hike from Yura Test
cla ones _ AL1 wen wers nombers 4 ‘ho a TSU on duty at this Gtation. ~
setbaacinlee $7 = PPOs 3 —

2. Between 1505 and_1510 hours 1STone of the mon, CPL WER, who bas a
degree in solenes and a strong background in moteorology, called attention of
ths group to on objest diractly overhsad. At this time the grovp was sented
on the east side, ani in the shade of a tros, botreen the vanal bar’ and ths
Colorado River, approxirately three (3) milos south of Yuma Test Station on the
Arinona cide of the River. Tho object was seen immediately by tho ontirs
grovp without eny diffloulty in foousing the oyes or loosting it owrhead.

It appeared flatevhits, with no sheon, cireular in sheps, and while on oa regalsy
ccurse of approxinately 60° aginuth, it did not exhibit «a completely sxooth
trajectory. It was accompanied internittautly by en appavont wapor trail,
none-peraistent, thin, end not any longer than one or tro object diameters.

This trail or tail disappoared immediately withia the above dinensions as is
accompanied the objoot.

Se This objoot ms first sighted by the group alnost direstly overhead
at an elovation angle in oxovas of, 60°. Dus to the position of the group is
relation to the ceral bank, the horizon to the oast was obstructed to «
heighth of approxinately six or eight degress clovatione ‘The total tins the
object was vicible botreen the firet elghtiog overhead and the Cisappesrancs
over tho horizon, was vory cloae to, and not more than seven seconds. In
apparent sice, theobject subtendad a olrole of approximately 1/4 Lach when
held at amr’a longta. a See

4. The group ms instructed that if euy subsequent sightings are nace
while they ere ocoupied in their atoigned weather cuties, that they should

attempt to teke bearings cu the object from tro or more theotolite Positions
and report their findivgs to th» Unit Commander. In this instance the

apparens motion of the object was co fast that it woulc have been Inpoasidia
to obtain engular readings on its trajectory with the theodolits even with
the goars disengaged oad sighting over the open gunsights--

6. Of the attached list of mon, FFC Gr is a craduate "nginessr with
lsboratory oxperionces C1, ar a graduate Erginear with propeller desiga
experioncss and M/SGT >» & University graduate ond was previously rated

a flight onginesr in U.S. Aly Forcee All of the sen ere preasntly training

as woather observers and have had som oxparienoce tracking meteorological
balloons with optical equipment. All of the men comwnted that the object
sighted vas unlike eny saturel object or a phenomena which they had over seen
proviously, and that they did not beliove 1% could bo mistakenly ideatlfica

as a woathor balloon. Ths group was told, peuding further instructions, not
to discuss this sighting. Attached is a list of the ign in this group.

6. On the following cny CPL WB and Pro War reported another
sichting while practicing with a theocolits. ‘the duration of the sighting

wan betveen five and ten vscodts-wit tha oprarent rotien so orratie that they
were urable to obtain a sighting on the course of the objoet with « theodolice.
ihe gonerel appearances of ths object was reported to be the sens a5 that acen
on the proosding cay, oxcept that no vapor trail was observad. Tha gensral
ocurre of the object mas in an oasterly direction

DOWNGRADED AT 3 YEAR Gay | UNCLASSIFIBA

DECLASSIFIED APTAR 12 YEN, Sesser

POD DIL 5200.10 take ees

ow
4 ce eye
\ sieeabees J a4 eo

7. Tho underaigved has oloven (11) yours military duty iamtecrology,
with a substantial portion employed on weather oguiyment dovelopment, and on
upper air observations outalling the use of meay si,os ool types of moteorologi-

eal ballooss. In my oxpertensee I have never observed any other objech, by ‘
comparison with which this objowt could be further identi fed.

ee
|. |e ae
znd Ue, Sig C

“77 "(3 ATITD AT ' ?

La che Sot is. tt
‘bue pov pi é Usek ore

pel NCLASSIF HED

—— eee