PROJECT BLUE BOOK

1
#181
Uor Ph Uo40
1OMON

150448
tiioh contain sono evidence but have no appiront roady alplanation. With loh inoidonts thus eliminatod, there remain thirty-four
aopepted as reliable and acourate. Mhen psyc.ologionl and phrnie- Thls statoneht is true only under the sssuption thit the ovidahce is
lerdonl fhotors ara taken into oulsidcratiin, all of thend iael.
ort ho exolnlned ratiomly, ad polnted ouy br Rrnd Certorat.en ribts or Alr Vatorlel Comcand Aerodfetioal Laboraiory (one
n0),
Ai a riol lonnd Aresadissi L0n i y
B12 Incid n'n conciderod)
anidontifiod flying objoots to Phorn ard suificiont poychologioal eitplanations ror tho
ports not otherwies explainible. Thoss errors in idestifying rel provide plausiblo explamasione
abimuli rocult chierly from inability to estimate speed, distanes, dize.
report, All of the remaining 3h inoidonts are tronted in detail in thA
Theso ineidents forn no pattern in rorard to aren or eit.t
over, that rono olghtiaga wero influenood by eerllor reper cobably: robably
biun no yiblloiby. un no yibllaity. roull not heva boon considorid tnusvat or repe roull not heva boon considorid wnubvat or rop
Projoob Grutgo
Sewy of to Daimddon grPasddry hoarts Seay or to Daraben gr PasddsRoarts
ViII. Sr oer Ao Bvluntion af ienininc Reperts
The ramining unexplainod ineldonts (ssa Appondz vth) exil
ineidant (Csidint Nio. 17). Kost vere distributed without pattem
throughout the United States. A fow vere outside the Hl. C. No tho desoriptldns of appearanco or perfornance wore exactly alike. The
parted olght ings ocourred at varlous times of day and voar. 0
ANDIE
toidont is censidored separatoly, Is is not the intent to gunernllyt La the folloving peotion of this roport, eacn ronadning wran
charaetor of obsorvers, bit each onse lns undesirable elanshts, aar
annot bo diorngurded. Thu numerioal deoignation is harely the catsgark Jer or the tnoidont in the projoot filos.
M, 2 , , 31, 40, 51558, 62, 64, 63, 71 75, 76, 97, 79,
1M, 122, 134, 135, 151, 152, 254, 153, 168, 195,39, 136, 193, 27, 23.

haust flames spead i3 airoraft was re-
ported as much F-51. It also had a
high rate o uld almost straight up
or down out of radar elevation limits object geemed
cognizant of the whereabouts of the which
ment.
The5.51 tntanoanto
Imately 9 m slowly clo 3e 'eet
when obiac uddenly ac and
disappear radargcop3. Lataroar
to effect normal diyin are each
case was unsucces Arter six dixin sighting3 had been
lost, the obfect not again detected althouizn interceptor
continued to search area untillapproxinately Ol3o.
a

OSAT 4 183 inc,
UNCLASSIFIED
ATTENTIONF PROJECT SIGN
IT HAS BEEN REFOREED BY CARLE FROM FEAF THAT AN UNIDENTIFIED
OBSERVER OF AN F-61 CN 15 OCT 48. THE OBSERVERS MHINK IT FOSSIBLE THAT TWO
UNIDENTIFIED AIRCRAFT WERE INVOLVED IN THE INTERCEPTICN. THE SIGHTINGS
OCCURRED AT NICHT: HOWEVER, THERE WAS SUFFICIENT MOONLIGET TO PERMIT A SILFDUETTE
TO BE DISCERNED ALTHOUGH NO DETAILS WERE OBSERVED. IT WAS IMPOSSIBLE TO ESTIMATE
THE SIZE OF THE AIRCRAFT OR WETHER IT WAS JIT OR PROPELLER MRIVEN. NO TRAILS
OR EXHAUST FLAMES WERE SEEN. THE SPMED OF THIS AIRCRAFT WAS REPORTED AS
BEING MUCH GREANR THAN THE SPEED OF THE F-61. IT ALSO HAD A HICH RATE OF
ACCELERATION AND COULD GO ALMOST STRAIGHT UP OR DOIN OUT OF RADAR ELEVATION
LIMITS. THIS AIRCRAFT SEIMED TO BE COGNIZANT OF THE WHEREABOUTS OF THE F-61 LIMITS. THIS AIRCRAFT SEIMED TO BE COGNIZANT OF THE WAEREABOUTS OF THE F-61
AT ALL TIMES, WHICH MIGHT INDICATE THAT IT CARRIED RADAR EQUIPMENT. THE AT ALL TIMES, MHICH MIGHT INDICATE THAT IT CARRIED RADAR EQUIPMENT. THE
EXACT LOCATION OF INCIENTS WAS NOT INDICATED IN INFORMATION RECEIVED BUT EXACT LOCATION OF INCIENTS WAS NOT INDICATED IN INFORMATION RECEIVED BUT
WILL BE DETERMINED. WILL BE DETERMINED.
En 4 END 4
IM/CASF WASE D. C. ~
TO CG AMC SUBJ: SPECIAL RPT A-2
-2 DOWNGRADED
DECLASSIFIED
DOD Dhiwis
UNCLASSIFIED
DOWNGRADED AT 3 YEAR INTE DECLASSIFIED AFTER 12 YEABS
DQD DIE 5200.10 183

Third picked up at 3 miles and los 10 miles.
Four, five and six: all picked up at 9 miles, lost at l2oo feet.
The last three sightings took plece during a lo mimute period, In
each instance the F-6l detected the object approximately 9 miles each instance the F-6l detected the object app roximately 9 miles
ahead, slowly closed to within ax l2ooOfeet when the object suddenly ahead, slowly closed to within ax l2ooOfeet when n the object suddenly
accelerated speed, dove and was lost fron the airborne radarscope.
Interceptor attemoted to effect normal Interceptor attemoted to effect normal pickup by diving also but
wesh unsiccessful wash unsiccessful race time. After 6 sightings had been lost, the race time. After 6 sightings had been lost, the
ob ject was not detected again although interceptor continued to search
the area until aoproximately Ol30 . the area until aoproximately Ol3o . ITEM 16 Oct. Confirming ITEM 16Oct. Confirming phone phone
request for weather and vicinity of incident, weather repor ts Thlmoi for the for the
Fukuoka erea indicated unlimited ceiling,xxa wind calm, visibility SIHE
scattered.
Part II. Radar sites mentioned in previous radios are site l: At Shigano-Shima
at 33 401N - 132° CO1 east and site l8: at Fukae-Shima at 32° 45' N
128° 40 East
Incident 183

FCA07
HA-AEEEEEE AR PRIORITY GP Sa
HAAS UNCLASSIFI
03co7 23 05 32
1948 OCT 230M9 :27
ALA-03
PP JEQAB
I.MCT
FM UAPLA 38C/CG 2 MCI
TO QXN/UAPBG/CINCFE 9.MOREE
INFO JEQTL/USAF
/ JEQAB/CG AMC
AF GRNC UNCLASSIFI
TWO CMA TWO THREF OCTOBFI TS TO
FOLLOWING INFORMATION IS SUBMITTED CLN PART ONE PD INTERCEPTOR AIRCRAFT
VISIBLE TO GROUND RADAR ONLY PERIODICALLY AS IT FLEW IN AND OUT OF
PERMANENT GROUND RETURN AREA IN WHICH SEARCH WAS CONDUCTED PD TIME
OF RICKUP OF INT R BY GROUND RADAR NOT LOOGED SINCE PICKUP
JAS IDENTIFIED EACH TIME AS 7RI ON FRIEND
Y OBJECTS
OF
DOWNGRADED AT 3 IEAR INTERVA DECLASSIFIED AFTER 12 YEARS.
DOD DIR 5200.10
INTINE 133

AND LOST AT ONE ZERO MILES CMA FIVE CMA SIX ALL UP AT
NINE MILES LOST AT
ONE TWO ZERO ZERO FEET PD THE LAST THREE SIGHTINGS TOOK PLACE
SIX
CLOSED TO WITHIN ONE TWO ZERC 0 2 ERO ZERO FEET WHEN THE OBJECT SUDDENLY
IS LOST FROM THE AIRBORNE RADAR
SCOPE PD INTERCFPTOR ATTENPTED
BUT NASH UNSUCCESSFUL BACE TIME PD AFTER SIX SIGHTINGS HAD
CONTINUED TO SEARCH THE AREA UNTIL APPROXIMATELY ZERO ONE THREE
ZERO ITEM CMA ONE SIX OCTOBER PD CONFIRMING PHONE REQUEST FOR VEATHER
AND VICINITY OF INCIDENT CMA WEATHER REPORTS FOR THE FUKUOKA
AREA INDICATED .IMITED CEILNG CMA WIDS ILITY FIVE
UNCZASSI
3
ANCRADED AT 8 YEAR INTERVALS
DECLASAIFIED AFTER 13 YBARS. G1R 6200.10
OCL

Hq AMC Form No. 10-513 (Rav 20 Feb 48) WF-4L-13 JUN 43 200M
UNCLASSIFIEL
HEADQUARTERS
IN REPLY ADDRESS BOTH AIR MATERIEL COMMAND
VELOPE TO COMMANOING COMMUNICATION ANO EN- WRIGHT-PATTERSON AIR FORCE BASE
GENERAL, AIR MATERIEL COMMAND, ATTENTION FOL- DAYTON, CHIO
LOWING OFFICE SYMBOL: LOLAXO-3/Gn/dw
MCIAXO
NC 1948
SUBJECT: Request for Investigation
THRU: Chief of Staff
United States Air Force
Washington 25, D. C.
ATTN: AFOIR
TO: Commanding General
FEAF
APO 925
c/o c/o Postmaster Postmaster
San Francisco, San Francisco, California
1 1. Reference is made to message AX4943-A2 dated 26 0ct 48 AXl943-A2 dated 26 Oct 48
(250800z), regarding (250dooz), regarding radar sighting of radar sighting of unidentified aerial object
by F6l radar. It is requested that source Ease Intelligence
Officer be directed to initiate further investigation of this re- Officer be directed to initiate further investigation of this re-
ported sighting. ported sighting. An Essential Elements of Information form is An Essential Elements of Information form is
attached as an aid to the interviewing officer in obtaining the
desired information.
2 Pertinent information relative to the reported object is
desired as follows:
a. Was object apparently practicing radar evasive tactics
when it disappeared from the scope periodically, or was it running
into normal skip "null" zones affectin cope of all
aireraft?
DOWNGRADED AT S YEAR INTERY T-70004-A
DECLASSIFIED AFTER 12 YRARS
0179 DOD DIR 5200.10
TEa M
ONCE
700

JNCLASSL
PAGE THREE UAPLA 38C
RADIOS ARE SITE ONE AT THI J
EAST AND SITE ONE EIGHT AT FUKAE DASH SHIMA AT THREE TWO DEGREES FOUR
FIVE MINUTES FIVE MINUTES NOR NORTH IDASH ONE TWO EIGHT DEGREES FOUR - ERO MINUTES LAST MINUTES LAST
PD END END
| AX.4932A2 AX.49324 2-Morleond 2-NoRlcond
Reid 0050 AX-4150 T Cle Tw Cles
AX-Y852 A x- Y 8e I
260it18 26ot48
Hold t HM. Holf T A.M. aParaebrace pot reguired Handie as A
.0 Parapbrase not required. Handle as
correspondence
per paragraph 51 i and 60a (4), AR 380-5
DUWNGRADED AT 3 YEAR INTERVALS DECLASSIFIED AFTER 12 YEARS.
DOD DIR 5200.10
C

OPR
UNCLASSIFIEL
AMC
Subject: Request for Investigation
b. Did object give normal indication on scope such as
indicated by conventional aircraft?
3. It is requested all pertinent material be forwarded to
Commanding General, Air Materiel Command, Wright-Patterson AF
Base, Dayton, Chio, attention MCIAxO-3.
FOR THE COMMANDING GENERAL:
CL OSAF
1 Inel MeCOY
EEI Form Colonel, USANJ
Chief, Intelligence Department Chief, Intelligence Department
AFOIR-CO-2 (A-3865) lst Ind 21 060 1948 21 0E0 1948
SAF, Washington 25, D. C. SAF, Washington 25, D. C.
TO: Commanding General, Far East Air Commanding Forces, AP0 925, c/o Postmaster 925, c/o Postmaster
San Francisco, Cal San Francisco, Cal Alifornia
1sm 7m
1 1 Incl:
n/c
2nd Ind
HEADQUARTERS, FAR EAST AIR FORCES, APO 925 2 JAN1S49
TO: Commanding General, Fi: Force,
l. Forward with request contained in basic com-
munication.
2. Sighting in question yos initially made at 2y05/I on 15 Cctober
1943 in the vicinity of by an F-6l flying airborne alert for Camel
Control.
HITEHKAD:
DOWNGRADED AT S YEAR INTERVXLSW
9 1 CDECLASSIFIED AFTER 12 YRA RH
DOD DIR 6200:10 INSON
—nd he
Incl: n/c 2
00641 T T-70004-A
A-2# 700
UNCTASSIFIED

OPR
UNCLASSIFIED
8S10: Ltr, H, air materiel Gonand, wright-fettal son air Force
Bese, Dayton, Ohio, Pile Molako, Subj: "ieguest for lnves-
tigation", dtd 9 nov 42.
333. 3rd Ind. //300
HLDGUKILRS, FIFTH ALE POROD, APO 71O
T0: Comcending Gonaral, Sl5th air tivist an, Itisuls dr Force
Bese, Aru 929
For compliance with basic comlunication.
BY COSAD CF MAJCA GaGLL PAnTIGh
2Lm
TOOSn
1 Ingl Colonel, USaF
n/c ass't ohief of stiff, a-3
F 333 4th Ind
Headquarters, 31 Sth Air 1943
TO: Conmanding General, Fifth Air F rce, APo 710
1. There was a total of six sightings of the un- 1. There was a total of six sightings of the un-
identified object. With the exception'of tbe initial
sighting, no radar evasive tactics were vsed. During
the initial sighting t the F-6l aporoached the target from
the rear with e twenty MPH speed advantage. When the
F-6l approached within 12,000 feet, the target executed
a 180o turn and dived under the F-6l. The P-6l lattempted
to dive with the target but was unable to keep pace.
Rate of descent of the F-6l was minute.
2. It is believed-that the object was not lost
from the scope due to the normal skip "null" zones common
to all radar equipment. The pilot and _observer feel that
4598 it was the high rate of speed of the object vhich enabled
1t 50 disa Deear 50 rapidly,
3. From the information contained in parecraph one
it is quite possible thet the ohject had some tyne of radar
varning eguiprent to detect any airoraft anrroaching within
a range of 1 12,000 feet.
241
DOWNGRADED AT 3 YEAR INTERVALS; UNCLASSIFIED
DECLASSIFIED AFTER 12 YRARS.
DOD DIR 5200.10

I
UNCLASSIFIED
O
Incidont wlel -- noar Dayton, Ohio -- 14 Vctober 1948
There is no assronomical explanation for this iroident.
4
Sinco the spond of the plane was .ii, if it had
passod throuj. u cluster of s
.
would undoubtedly na obsorvors
wiizzing by, aich as tolophone polos apponr appoar frow a wirdow of a frow a wirdow of a
speuding train. speoding train.
statosont t
there would have been no time for idontifioution.
UNCLASSIFIED
a
7-3712-10

Ohio,
quest for Investigation", dtd 9 Nov 42.
4. The return on the_ radar scope from the unijentifled
target wis the sare as that from onventional airoreft.
5. The radar observer estimated that on three of the
sightings the object traveled seven miles in approximately
twenty seconds, giving a speed of aoproximately l,200 NPH.
As the target disappeared from the scope it gave the indi-
cation of continued accelleration.
FOR THE IMANDING GENERAL:
Incls CLARENCE
Added 3 Incls 1st Lt, USAp
2. Sketch of Ob ject Asst Adjutant General
3. 3: Statement of Lt Statement of Lt
Halter (6 cys)
4 4 Statement of Lt
Hemphill (6 cys) Hemphill (6 cys)
333 333 5th Ind INT/SM/sb INT/SM/sb
HEADQUARTERS, FIFTH AIR
TO: Commanding General, Far East Air Forces, AP0 925
L Incls
1. r n/c
2. n/o
3. Sextp copy incl 3 w/a
40 11 4 1 PrAVED
02617
DOWNGRADE DECLASSIFIED AFTER IE IHARS
DOD DIR 6200.10
ENCTASSFIED A
© 700

BASIC: Ltr, Hq, Air Materiel Command, tright-Fatterson Air Force Base,
Dayton, Chio, File MoIaxo, Subj: "Request for Investigation,"
dtd 9 Nov 48
AG 333- OP-2 6th Ind.
IEADQUARTERS, FAR EAST L
THRU: Chief of Staff, United States Air Force, Washington 25, D. C.
ATTN: AFOIR
TO: Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio
L8
Inclst S.A.S.
1. 1, n/c n/c
2. n/c
3 n 3 Quintp copy of Incl 3 w/d
4. 4 I1 11 2 I1 # 4 w/d 4w/d
AFOIR-CO-16 (A-3865) (A-3365) 7th Ind D4APR 1943
Dept. of the Air Force, Dept. of the Air Force, Hq USAF, Washington 25, D. C.
TO: Commanding General, Air Materiel Command, Wright-Patterson Air Force
Base, Wright Field, Chio. ATTN: MCLAKO ITTN: TTPA
Mm
44 Incls
n/c
0177
DECLASSIFIED AFTER 1Z LAARS UNCLASSIFIED
DOD DIR 5200.10
0179

UNCLASSIFIED
ESSENTIAL ELEAENTS OF INFO:MATION
(Re Sightings of Unidentified Aerial Objects)
PROJECT "SIGN"
1. Date of sighting - 15 October 1943
2. Time of sighting - 2305 Item
(Zonal by 24 hr clock)
3. Where sighted:
3 Ground
(1) City, town.
(2) Distance and direction from city or town road,
interse
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude
and longitude.
b. Air
-
(1) Type al rcraft, speed, altitude, direction of
flight - Type unknown. Speed varied from approxi-
mately 200 mph to l2oo mph. Altitude varied from
5,Ooo to 7,o0o feet. Direction of first sighting 5,000 to 7,00 Direction of first sighting
target was heading south, reversed itself and was target was headin south, reversed itself and was
last seer orth. 'Second sighting headed
northwest. ighting headed northwest.
Fourth sightin outhwest. Fifth and sixth
lorthwest.
(2) Distance & direction from city, town or known
landmark. - Approximately fifty miles northwest
of Fukuoka, Kyushu, Japan.
(3) object from observer's aircraft;
Sighting 12 plclock
Sighting oiclock
Sighting NNmdo 10 p'clock
Sighting 12 o'clock
Gighting 12 o'clock
Sighting 12 o'clock
(4) Latitude and longitude - 30240'N 13090013.
UNCLASSIF
DOWNGRADED AT 3 YEAR INTERVALS.
DECLASSIFIED AFTER 12 YEARS.
DOD DIR 5200.10 700
Cul 1

UNCLASSIFIET
Page 2
EEI Project "SIaN"
3. (Cont'd)
C. Sea
(1) Latitude and longitude
(2) Proximity to land (name city, country, ete)
4 Number of objects - Six (6) sightings, one_at a tire..
Estimate total to exceed two objects.
a Formation type (if any) (sketch if possible) - Ob-
jects were not in formation.
50 Distance of object fror observer
a Laterally or horizontallv Laterally - 3,000 to
10 miles, Horixontal 1,000
feet above.
b Angle of eleva tion from horizon - Elevation Iror in-
tercepter aircraft Lower than lo? below
to off lower limits
C. Altitude - Froo 5,000 sea level to 7.000 feet sea
level or 2,000 feet be 'eet above inter-
cepting aireraft
Pime in sight - Total
Were a minute or I less in duration,
7. ppearance of object .
a
b
e. Apparent construction (translucent) - Wing tvpe un-
known. At time of only visual sighting target was on
a level with observing airereft. Under night visibility
all that was visible vas a silhouette, Type of tail
stabilizers is unknown. General Classifieation -
very short body giving a stubby appearance, Canopy,
if present, was forred into aircraft body to rive the
object clean cut lines and was not discernable.
8. Size
(1) Sstimated size - Twenty (20) to thirty (30) feet
DOWNGRADED AT 3 YEAR INTLENETH, wing span cguld not be determined.
DECLASSIFIED AFTER 13
DOD DIE 5200.10 T R0004-A

UNCLASSIFIED
Page 3
EEI Project "SIGN"
7. (Cont'd)
d. (Cont'd)
(2) Size as it appeared fror observer's view (com-
pared to known object) - Approximately the same
length as USAF F-47.
8. Direction of 2a (1)
9. Tactics or maneuvers
a. Vertical ascent or descent, horizontal, oscillating,
fluttering evasive, agressive, erratic, etc. - See
attached statements.
10. Evidence of exhaust - No evidence of exhaust seen
a. Color of smoke
b. Length and width Length and width
C C. Odor (if any) Odor (if any)
d Rate of evaporation Rate of evaporation
e. Does trail vary Does trail vary with sound? with sound?
(spurts)
11. Effect on clouds Effect on clouds
a. Opened path thru clouds
b. Formed cloud or mists
C. Reflected on cloud - Silhouette of object vas projected
on the clouds by a full moon. Couro 65 005e64ds
d. Shown thru cloud OudN Mc2
12. Lights - No lights were seen S
Refleoted or attached
Luminous
C. Blinked on and off in relation to speed
13. Support - Undiscernable
DOWNGRADED ATS HRARdKnATiC lIft fuselage
DECLASSIFIED AFTER 12 YRARS. OHCLASSFTEG I 7OU0NA
DO0 DR 6200.10

GIOASE
Page 4
EEI Project "SIGN"
13. (Cont'd)
C. Vertical jet
d. Rotating cylinder or cone
o. Aerostatic lift (balloon or dirgible)
14. Propulsion - Unknown
a. Propeller or jet
i. Rotor
C. Aerodynamic vanes (flapping or oscillating) (Katz
Mayer effect)
d.
15. Control and stability - Unknown
a. Fins Fins
b. b (Horizontal or vertical)
(1) Size
(2) Shape Shape
(3) 1 (3) Location
16. Air ducts - Unkrown
a. Slots
b Duct openings
17. Speed - MPH - From a known speed of 200 NPH to an esti-
mated speed of 1200 MPH
18. Sound - Unknown
Cortinuous whine or buze
b. Roar, whistle, whoosh
C. interaittent
Wes any radio antenna to be observod, (any pro-
Jeetions gr axtensdons
9s sucn) - None
DOWNGRADED AT S YEAR INTERY
DECLASSIFIED AFTER 12 YE
DQD DIR 5200.10

Page 5
EEI Project " SIGN"
20. See attached statements
a. Explode - Negative
(1) Possibility of E fragments
Other physical
b. Faded from view - due to high rate of speed S
c. behind obstacle - Negative
Relative to the Observer
1. Name of observer - lst I Lt. Oliver Hemphill and 2nd Lt.
Barton Halter
2. Address - 68th Ftr. Sq., 347th - APO PM
San Francisco. California San Franc: co, California
3. 3. Occupation - Lt. Hemphill Occupation - Lt. Hemphil: - Pilot, Lt. Halter - Radar - Pilot, Lt. Halter - Radar
Observer
4. Place of business
a. a. Employer or Employer employee employee
5. Hobbies Hobbies
a. a. Time Time engaged engaged in hobby (experience). Is observer Is observer
amateur astronomer, pilot, gineer, etc. - Amateur
Photography
6. Ability to determine
a. Color - Normal
b. Speed of moving objects - Normal
C. Size at distance - Normal
7. Reliability of observers - Excellent
a. Sources
(1) Neighbors
(2) Police Dept
(3) FBI records
(4) Employer UNCLASSIFIED
DOWNGRADED AT S YEAR INTERY
DECLASSIFIED AFTER 12 YEARS. T2000 A
DOD DIR 5200.10

Page 6
EEI Project "SIGN"
8.
a Sightings i in general - Both officers can be considered
qualified observers
b. How attention was drawn to objects(s)
(1) Sound
(2) Motion - By both Radar and visual means
(3) Glint of light
9. Witnesses -none
a Addresses
b. Occupation apar6ism
c. C. Reliability Reliability
10. Comments of interrogator re intelligence and character
of person interrogated.- Both officers are of of person interrogated.- Both officers are of excellent
character and intelligence and are trained observers.
Relative to Radar Sightings
1. 1 Re radars now operating on ground - Radars Re radars now operating on ground - Radars were operating were operating
on the ground but did not at on the ground but did not at any tine pick any time pick up any airborne
torgets except the F-61. targets except the F-6l.
a Observations of range, speed, altitude and size of
target - None
b Does target execute any turns? If so, whet angle (1800),
etc. and what radius of turn. If radius of turn is not
observable, how long did the target stay in the turn
and what was its speed?
C. Note particularly any separation distant target
into Several targets uoon oach. Track all if
possible,
2. If airborne, when object was sighted.
a. Here there any rednr
radio circuits - None
Hye astir9te3
DOWNGRADED AT 3 YEAR INTERV
DECLASSIFIED AFTER 12 YEARS 7000-A
DOD DIR 320019 UNCLASSIFTED

UNCLASSIFIED
Page 7
EEI Project "SIGN"
GENERAL
I. Teletype
sky high Scattered, visibility 5 mi les in haze, tempera-
ture 58, dew point 56, wind calm. 2400 I, sky high
seattered, visibility'6 riles in haze, temperature 57,
dew point 56, wind calm
2. Winds aloft report - 2305I (1505Z) 15 October 48
Surface ! Calm
1,000 1 Calm
2,000 200 7 Knots
3,000 1 360 5 Knots
4,000 4,000 : - 3200 2 Knots
5,000 1 - 1900 1900 8 Knots 8 Knots
6,000 - 200 12 200 12 Knots Knots
7,000 2002 17 Knots 200° 17 Knots
8,000 230 24 Knots
9,000 2302 25 Knots 2302 25 Knots
10,000
3. Local flight schedules of cormercial, private and rilitary
eircraft flvins in vicinity at the time (Check Canadian
activity if close to thet border) - Flight schedules of
all aircraft in the local area were checked with negative
results
4. Possible releases of testing devices in vicinity sent aloft
by Ordnance, Navy, Air Force, Army, Teather Units, Research
Organizatiohs
5. If object contacted earth. obtain soil sarples withir and
without depression or spot where objeet landed (and then
presumably departed) for purgoses of raking compirison of
Soils - Does not apply
If object cara suffiotectiy near othar a TePE
obiogts, check crraces wlth feiger eountarg Cor possiule
radioactivity. Make comparisons with other unafrected
alrcraft objects. D
DOWNGRADED AT 3 YEAR INTER
DECLASSIFIED AFTER 12 70009
DOD DIR 5200.10 YEARS UNCLASSIFIEL

SECREE UNCLASSIFIED
Page 8
EEI Project "SIGN"
7. Obtain photographs (or original negatives) where avail-
able; if not, secure sketches - See attached sketch
a. Object
b. Surrounding terrain where object was observed
C. Place where objected contacted earth (if this haprened)
d. Maneuvers
e. Formation (if more than two)
8. Secure signed statement - See attached staterents
9. Obtain fragements or physical evidonce where possible.-
None
UNCLASSIFTED
DOWNGRADED AT 3 VEAR INTER"
UECLARSIE FIED AFTER 12 YEARS.
DOD DIR B200.19

INCILENT INDEX
1. Astrononioal
a. Bigh probability:
95, 96, 97, 98, 101, 102, 103, 104, 116, 119, 132, 136, 140,
147, 148, 158, 17
219, 238,
b. Falr or low probability:
W19, 20, 23, 24, 28, 35, 36, 46, 80, 63, 67, 80, 82, 93, 1C0,
112, 120, 121, 129, 130, 144, 153, 165, 166, 167, 175, 192,
2. Non-astrononioal tut suggostive of other explanations
m. Balloons or ordinary airoraft:
126, 131, 138, 141, 145, 155, 156, 3 157, 159, 160, 161, 163,
169, 171, 173, 178, 180, 182, 188, 190, 194, 195, 196, 193.
200, 201, 2 209, 210, 217, 222, 235, 237, 239,
b Kookets, flares or falling bodies:
4,5,6,7,8, 4,5,6,7,8, 9, 12, 13, 14, 15, 9,12, 13, 14,15, 16, 25, 55, 65, 78, 106, 107, 16, 25, 56, 65, 78, 106, 107,
108, 109, 133 108, 109, 13 170, 211, 218. 0, 211, 218.
Misoellaneous (reflections, aurora streanera, blrds, eto.)
39, 89.
3, Hon-astronouioal, no evident
a.
38, 44, 45, 47, 55, 57, 72, 86, 87, 88, 90, 99, 110, 117, 118,
125, 127, 137, 139, 149, 150, 177, , 213,
229, 232, 233,
b. Myidence ofrored auggests Do exolanation:
# 2 10, 17, 21, 29, 37, 40, 51, 52, 58, 61, 62, 64, 68, 71,
76, 76, 77, 79, 84, 105, 111, 122, 135, 151, 152, 154, 162,
188, 172, 176, 183, 186, 193, 207, 215, 223, 224, 225, 226,
227, 236, 241, 242, 243, 244, 134

BELDENTIFIED TAROET AS CBSERVM OCT. 1946 23051
UNCLASSIFIED
vertieal Pail surfaces very Wing Size i Siupe undiscarnalle
due ull if presont, lorizonal at observers visual angle.
Tail sgriaeds undiscernable
at vbservere visual angle.
Power Section Canopy or Greanhouse if present.
todiscernable Formed into main body and was not
discernable.
Rear of Lody
cut ofr marply cut off marply
1
1 1 Body length approximately the Body length approximately the
1 same as conventional Fighter same as conventional Fi,hter I
K type aircraft. _1
1 DOWNGRADED AT 3 YEAR INTERVALS
1 DECLASSIFIED AFTER 12 YEARS.
1 1 DOD DIR 5200.10
1 1
Color or lorkings undiccornable sther tian
700 U4A very dull or dark finish
UNCLASSIFT
CEODEE

On 15 October 1948, my pilot and I started out on a rou-
tine mission off the northwest coast of Kyushu. When, at
2305 I, we wen approximately 50 miles at 330o from Fukuoka, S
I picked up an airborne target. I It showed up at a renge of
advantage
of 20 mph. The target showed no evasive action at first, and
change ,
thereafter, a matter of seconds, the target gave the indi-
cation of diving beneath us.
get squared away to follow, it
had gone. I was notified by my pi-
lot that we were diving at a rate of 350o feet a minute at
300 mph. I I had intended to ask the pilot to peel off after
UNCLAL
DOD DIR 520010-
700 ler

portside. By the time I made the pickup it vas at 450 port
attempt to head off the targat. By the time we got astern
of it, it was off again in a burst of speed and dissapeared
between nine (9) and ten(10) miles.
On the fourth interception, the pilot called to me that
we had been passed we I from above from the rear from above from the rear by our target. our target.
ten niles dead ahead and slightly ten niles dead ahead and s slightly above. On the fifth and
sizth interceptions, tle arget e arget appesred appeared at at 9 plus miles doing 9 plus miles doing
aporoximately 2oo mch. bad an advantage of 20 moh making
high
a burst of speed the target pulled away to the outer limit of
my set which is lo miles for airborne targets. 1 This took approxi-
mately 15 to 20 seconds.
In my ooinion, we Tere shom a new type atlet sone
agency unknown to US.
My experience is 30o hours as fadar o observer, and 700
hovrs commeroial pilot fligbt instructor. I an a greduate of
DOWNGLADED AT S EOS
DOD DIR 520020

ASSIFED
Night Fighter School, Boca Raton Florida. I I have no combat
time.
Babton Haltu
BARTON HALTER
2nd Lt, USAF, A0-878470
68th Fighter Squadron (Aw)
APO 75
41A3351622
DOWNGRADED AT S YEAR INTERVALSY
DECLASSIFIRD AFTER 12 YMARS. An1n
DOD 'I.
70004

a tremendous burst of speed and dived so fast that we were
unable to stay with it. At this point the intercepting air-
. feet. Our second tar-
ception was attempted, but the aircraft immediately outdistanced
us. At this time uzzled by the tremendous bursts of
The third target was
the target thrown against a very flective undercast by a full
DOWNGRADED AT 3 YEAR INTERVALB;
DECLASSIFIED AFTER 12 YEARS.
DOD DIR 5200.10. 5 700
d141 THCI cicIsn

4. my
200 mph. I caught just a fleeting glance of the aircraft;
just enough to know he had passed me. T The fifth and sixth
targets were atemped radar interceptions, but their high rate
of speed put them immediately out of c
S
German ME-163. German ME-163. I It was not a It was not ME-262 or similar jet. I base ME-262 or similar jet. I base
1945. At that time I was a B-l7 pilot, with the 4δ6th Bomb
Group (E) Station 174th, 8th Air r Force, i My total flying time
is 900 hours of which 350 hours ime.
mphl
OLIVER HEMPHILL Jr:
1st Lt, USAF, A0-784156
68th Fighter Squadron (AW)
APO 75
DOWNGRADED AT 3 YEAR INTERVALS: UNCTASSIFIED
DECLASSIFIED AFTER 1E YRABS DOD DB S200L10

2. Exret time (local) 2305
3. Flece of Obsew tion Fusuoka Area Betw en Shiaamo Shima 33040'N
by 132°00'E and Fusae Shima 32°4 Japan
L. Foaition of observer
Air
1C What attracted attentien to object pip of unknown airoraft
appearing on aibborne radar
6.
6
7. Apperent size
20-30 ft. long
3. Color of object
n/3
9. Ghape
Liks airoraft, stubby, clean lines
1C. Altitude
5,000 to 7,00 ft.
12. Direction from
12. Dietence from oruerver
3,00o' - 10 miles laterally - 2,000 to 1,000 ft. above
15. Direction of fli Dojcotis
1st-S, 2nd-Nw,3rd-NN, 4th-SN,
24. 24. ime in siht ime in sight
10 minutes total 10 minutes total tings le as ngs le 33 than minuts mimuts
15. 15. sreed
200-1200
20, 10, sound and sour ind dor
N/3
17. Frad
No exhaust flames or trails seen
18. Luminosity
N/S
12. Projections
20. i.aneuvers
F-61's ascent, cognizance or
..enner'of disarpearance mas.
21. Accelerated speed and was lost to airborne radarscope
sight
22. Iffect,on clouds
N/3
2 3. Additional i infortition concernin obiect
24. Weuther conditions
to 6 miles with hazy cloud coverage l2 scattered
over)

0
Inoident rle3 -- Japan -- 15 Jetobor 1943
There doos not appoar to bo wnytning astronomical about
this ineidont.
fadar oxports sho.ld dotor ine the reliability of tho
data, partioularly concorning woselerution rates.
D D
UNCLASSIFIED
5
I

Incident No. 163 -- 15 0ct. 194,8, 2305 Hours, Fusnoka area,
Japsn.
J Airborne rador observer in F-5l attenpted six times to intorcept an
object between 5000 and 6000 ft. The object traveled 2oo MPH until
approached to within l2,ooo ft., then suickly sccolorated from scope
at estirated laco ft. Pilot saw
silhoustte on undercust of object with 'ounded nese, gamral projoc-
AC Opinion: There is no a parent explanation. One discrecancy
seems to that the target was nover seen by ground radar, which was
operating and had the F-ll in sight throughout period of ighting.
C
O

Dr HYNEK'S EVALUATIONS EXTRACTED FROM PROJECT GRUDGE REPORT.
INCILENT INDEX
1. Astrononioal
a. Eigh probability:
i26, 27, 30, 31, 32, 33, 34, 48, 49, 59, 60, 66, 69, 70, 94,
95,96, 97, 98, 101, 102, 103, 104, 116, 119, 132, 136, 140,
1$7, 148, 158, 174 208, 216,
219, 238.
b. Fair or low probabilitys
, 20, 23, 24, 28, 35, 35, 46, 50, 63, 67, 80, 82, 93, 1C0,
112, 120, 121, 129, 130, 144, 153, 160, 166,167, 175, 192,
199, 202, 205, 220, 230, 240.
2 Hon-astrononloal but ther explanations
a Balloons or ordinary airoraft:
3, 11, 22, 41, 42, 53, 54, 73, 81, 83, 91, 92, 113, 114, 115,
126, 131, 138, 126, 131, 138, 141, 145, 155, 156, 157, 159, 160, 161, 163, 141, 145, 155, 156, 157, 159, 160, 161, 163,
169,171, 173, 169,171, 173, 178, 180, 132, 188, 190, 194, 195, 196, 198,. 178, 180, 132. 188. 194, 195, 196, 198,.
200, 201, 200, 201, 209, 210, 217, 222 22 23 237, 239-
b b. Rookats, flares or falling bodies: Rookots, flares or falling bodies:
4, 5, 6, 7, 8, 9,12, 13, 14, 15, 16, 25, 56,65, 78, 106107, 4,5,6,7,8, 9, 12, 13. 14, 15, 16, 25, 56, 65, 78, 106,107,
108, 109, 133, 108, 109, 1 211, 218.
C, Missellaneous (reflections, auroral streamers, birds, eto.): 114
39,89 231, 234.
3. Non-astronomioal, vident
Lack of avidence preoludes
#38, 44, 45, 47, 55, 57, 72, 86, 87 , 88, 90, 99, 110, 117, 118,
125, 127, 157, 139, 149, 150, 1 212, 213,
229, 232, 233.
b. Evidonce offered suggssts no sxolanation:
Fl,2, 10, 17, 21, 29, 37, , 40, 51, 52, 58, 61, 62, 64, 68, 71,
75, 76, 77, 79, 84, 105, 111, 122, 135, 151, 152, 154, 162,
158, 172, 176, 183, 186, 193, 207, 215, 223, 224, 225, 226,
227, 235, 241, 242, 243, 244, 134.
17

Tright-fattareor Air Force Base
Daytor, Chio
ATTN: MCIAXO-3
1. Referarce is made to letter fron your hoadyuarters, ICiaxs,
dated 9 Karch 19l), subject "Jnidentified Flying Objeots," ana first
indorsoment dquarters, dated 31 Maroh 1yi9.
2. The incident' sunnaries 173 through 333 have boer cheoked
against routine woather-balloon asoents made by the Air Force, Nary
arainstt Bureau, Bureau. Cocments based on this rovien are Cocments based on this roview are inclosad. inclosed.
and feather and Neathe
3. It is regommended that the "Guide To Invostigatlon Of Uni-
dentified Aerial Objeota" dentifiad Aerial Ohjeota" changed as follows: Itam 15, "Direotion Itam 15, "Direotion
of Flight of Cbjeot," should be olurified so that vertioal and hori- should be glurified so that vertical and hori-
zontal motions ars distinguished if possibla, und possibla, and 3o that motion is
speclfied as the diroction towards whioh ths object aptears to move. speclfied as the diroction towards whioh ths objeet aptears to move.
"Rolative to Radar Settings" should irclude a statocent of tho "Rolative to Radar Settings" should irclude a statocent of tho type of
radar get used. radar get used.
FOR THE CHEF. AIR WEATIEP SLAVICE
131 W. A. West
2 Inols W. A. MEST
1 - Inoident Summarios Lt. Col., USAP
2 - Conments 173 thru 233 Ad jutant General

a
1s adf8
No. 183: Purely a radar report. If this report is accurate, couldn't
possibly bo a balloon.