PROJECT BLUE BOOK

PROJECT I0073 RECORD CARD
12. LOCATION 12. CONCLUSIONS
1. DATE Was Balloon
0
Between Frosno-Merced, Cali 0 Probably Balloon
25_Apr 58 Possibly Balloon
3. DATE-TIME GROUP TYPE OF OBSERVATION
Ground-Radar xWas Aircraft
Locel Ground-Visual Probably Aircraft
Air-Intercept Radar 0 Possibly Aircraft
GMT 25/1725Z AirVisuol
6. SOURCE 0 Was Astronomical
5. PHOTOS 0 Probably Astronomical
Yos 0 0 Possibly Astronomical
No Military
8. NUMBER OF OBJECTS NUMBER OF OBJECTS 2. 2. COURSE 0 Other. Other.
7. LENGTH LENGTH OF OBSERVATION OF OBSERVATION 00 0 Insufficient Dota for Evaluation
Unknown
4-5 sees 4-5 sees one SW SW
BRIEF SUMMARY OF SIGHTING 11. COMMENTS
10. A U-2 a/e on classified project
Circular Circular obj, size of pea at arms
, 05j 05j far above balloon far above balloon was was in the general area on date
longth. Wht time indicated. A balloon was
which was at which was 150,000ft 150,000ft. l80 degrees 0 degrees and
of turn was seen, then obj streaked of turn was seen, then obj streaked sighted by the pilot. The U-2 a/c
toward Pacific. did nake a turn in that general
area.

34
C
I SQG184 YDC163 XYA327 XDB122JBA124
KR RJEPHQ RJEDDN RJEDSA
DE RJWPJB 8E
R 252130Z
FM CONDR 66STH ACVRON
TO RJEPHO/DIRECTOR OF ITELLIGENCE HQ USAF WASH 25 DC
RJEDDN/COMDR ADC
RJEDSQ/COMDR AIR TECHNICAL INTELLIGENCE CENTER
RJWPJB/COMDR 27TH ADIV
BT
UNCLAS:
ORGLAZRSSUFOB 25/17462 APR 58 IN ACCORDANCE 58 IN ACCORDANCE
WLL ..
WITH AFR 260-2 THE THE FOLLOW FOLLOW INFORMATION INFORMATION IS SUBMITTED. IS SUBMITTED.
1AROUND) 1AROUND)1 IB/PEA) 1C.CLIGHT WHITE OR SIIVER 1DQNE) 1B PEA 1C.CLIGHT WHITE OR SILVER 1D QNF) 1E. N/A IF.
UNABLE TO DETERMINE 1G. NONE IH. NONE 1 UNABLE TO DETERMINE 1G. NONE 1H. NONE 11. NONE 2A. MERIDEN BLUE 11. NONE 2A. MERIDEN BLUE
FLIGHT WENT OVER TO INVESTIGATE AREIAL BALLON AND SAW WENT OVER TO INVESTIGATE AREIAL BALLON AND SAW OBJECT. 2B. OBJECT. 2B.
APPROXINATE 45 DEGREES ELEVATION, AZIMUTH (35) )DEGREES STARBOARD OF STARBOARD OF
LIGHT (FLIGHT HEADING_36D DEGREES) 20. APPROXIMATE 5 DEGREES S
ELEVATION, AZIMUTH 45)DEGREES _PORI OF FLIGHT (FLIGHT HEADING 300
DEGREES) 2D. MADE A 36S DEGREE TURN BALLOON THEN ROLLED OUT HEADING
SOUTH 2E. OBJECT MOVED AWAY AT HIGH SPEED 2F ONE MINUTE 3A. AIR

A.
413TH FIGHTER DAY WING
GEORGE AFB, CALIF, RELIABLE. WNW (
WNW 395 DEGREES
i 16,000 265 DEGREES 7 KNOTS,
30 KNOTS, 10,OD8 275 DEGREES 50 KNOTS, 1
29,000 2655 DEGREES 70KNOTS, 36,000 265 DEGREES 70 KNOTS, 50,000
wsw 250 1 DEGREES 15 KNOTS, 88,000
THAAN 15 PERCENT 7 NONE 8. ORJECT
10. AERIAL BALLON 36 DEGREES 35 MINUES 5WORTH 119 DEGRES 25 MINUTES
WEST AT
VEHICLE BEING PUT THROUG TESTS TESTS.1 HOHN KROEHLER JR 2/LT, DUTY
DIRECTOR. 12. NONE. DIRECTOR. 12. NONE. hine t thi deininl It is very hine t thi lilimind? It is very
BT in thi ai;wvith any digre of in thi ait,with any digre of
25/2200Z APR 25/22002 APR RJWPJB acaray with make eye acaray, with wahes epl
.
st Ropat stabs ballmn f
(Inita)

ATic
60 V
SQF179 YDD13D XYC244XMBJA
TFOA120
PP RJWPJE RJEDDN PJEDSQ RJEPHQ 44X22
BE RJWPFO 72 TO TELEPHONED
NO.
P 2522122 TIME
FM COMDR 83IST AIR DIV Ry: Dete
TO RJEDDN/COMDR NORAD
RJWPJE/COMDR 27TH ADIV
RJEDSO/COMDR RJEDSO/COMDR ATIC R ATIC
RJEPHO/ASST CHIEF OF STAFF INTELLIGENCE HO RJEPHO/ASST CHIEF OF STAFF INTELLIGENCE HO USAF USAF
RJEPHO/OFFICE RJEPHO/OFFICE INFO SERVICES, NQ USAF INF CES, HQ USAF .
T T
UNCLAS FROM FDOI 04-598, SUBJ: UFO. A. (1) UNCLAS FROM FD0I 04-598. SUBJ: UFO. A. (1)
CIRCULAR, (2) SIZE OF PEA HELD AT ARMS CIRCULAR, (2) SIZE OF PEA HELD AT ARMS LENGTH. (3) VHITE.
(4) ONE, (5) N/A (6) NONE. (7) NONE. (8) NONE. (9) NONE. B. (1) (4) ONE, (5) N/ NE. (8) NONE. (9) NO
FLIGHT WAS MAKING INTERDEPT OF WEATHER FALLOON AT TIME OF
SIGHTING. (2) WEATHER BALLOON WAS AT APPROXIMATELY 150,00D FEET
AND OFJECT WAS FAR ABOVE BALLOON. (3) ABOVE 1SZ,0OD. (4) WHEN
SIGHTED OBJECT WAS IN A TURN, AROUND OR NEAR BALLOON. 13D
DEGREES OF TURN VAS SEEN. THEN OEJECT STREAKED TOVARD PACIFIC
COEAN ON SOUTH-WEST HEADING. (5) VERY RAPIDLY IN A SOUTH-WEST
FIRECTION. (6) FOUR FIVE SECONDS. C. (1) AIR-VISUAL. (2) NONE
17s Mub
)nte Apput AFC
E hords ton
h 21 Mghl
nd

479
PACE TWO RJWPFO 72
(3) TWO F-1DOC, SERIAL NUMBERS 45,000 FEET,
33 DEGREES, -73 MACH, GEORGE AFB, CALIFORNIA. D. (1) 1725 ZULU,
25 APRIL 1958. (2) DAY. E. 3707N - 12015W, SITUATED NALFWAY
TETWEEN FRESNO AND MERCED, CALIFFORNIA. F. (1) N
M CAPTAIN, PILOT,
1/LT, PILOT, 43GTH FTR DAY SQUADRON, GEORGE AFB, CALIFORNIA. G.
(1) CLEAR WITH EXCELLENT VISIBILITY. (2) GROUND: 300 DEGREES/1)
KTS, 60D FEET: 330 DEG/5 KTS, 10,200 FEET: 310 DEG/25 KTS
15,525 FEET: 31S DEG/44 KTS 20,000 FEET: 310 DEG/45 KTS, 3Z,000
FLET: 3OO/DEG/ 44 KTS, 50,00D FEET: 250 DEG/37 KTS, 74,002 FEET
CDED/(B(3)
AEEAM UNLINITED. (4) 2DNM (5) NONE. (6) NONE. H.
NONE. 8. NONE. J. ONLY OTHER SIGHTING IN AREA WAS NONE. 8. NONE. J. ONLY OTHER SIGHTING IN AREA WAS WEATHER WEATHER
BALLOON, SIGHTED AT 3707N - 12D 15W. K- 479TH WING INTELLIGENCE BALLOON, SIGHTED AT 3707N - 12D 15W. K. 479TH WING INTELLIGENCE
OFFICER, CAPTAIN DEAN E. ABBOTT, PRELIMINARY Y ANALYSIS OF THESE Y ANALYSIS OF THESE
EVENTS REVEALS NO KNOWN REASONS OR CAUSE EVENTS REVEALS NO KNOWN REASONS OR CAUSE FOR THIS SIGHTING. E FOR THIS SIGHTING.
THE TWO OBSERVERS HAVE AN EXCELLENT THE E TWO T REPUTATION FOR VERACITY. REPUTATION FON
THEY WERE INVESTIGATING THE LARGE "SKY HOOK" WEATHER BALLCON 51 TXT
WHEN THE UFO WQS SIGHTED IN ITS VICINITY. 1. NONE/ END/ UNCLAS
ET
25/2220 Z APR RJWPFQ

N SECURITY YCLASSPICATION
JOINT MESSAGEFORM
SPACE BELOW RESERVRD POR COMMENICATION CHNTI
D
PAECAOINCE TYPE NEG (Check, ACCOUNTING SYMBOL ORIG. OR REFERS TO GP 40D IFICATION
PRIORITY REFEPENLH
ACTION BOOK MULTI CINOLE
INPO AIR MAIL X AF FDOI 04-598 UNCL
FROM: SPECIAL INSTRUCTIONS
COMDR, ATIC
TO:
COMDR, EDWARDS AFB, MUROC, CALIFORNIA
INFO: C
UNCLASSIFIED/AFCIN-4E4 5-$72-E
Ref para.'s l, 6b & 6c, AFR 200-2, subject UF0, and TT Msg
FDOI 04-598, 25 Apr 58, copy to COMDR NORAD. Request checks be
TU
made to determine if any flights, tests, or other operations known
between Merced and Fresno Cal
"Sky Hock" balloon. 00-feat. U UFO
UFo
reported seen rabove balloon
Ta
or around balloon, then streaked, repeat ards Pacific
"11600
Page l of 2 pages MBRAY 1958
OYMSOL SIGNATURE
AFCIN-4E4g 60
TYPED NAMS AND TITLE (SI) TYPED (Or JUMDd) MAME AND TIT
GEORGE T. GREGORY, CAPT., USAF
3x-1-w WaillacewSelwoeR
PHONE 6-9215 PAGE 1 NT.OP 2
N4. PAGEN Captain, USAF
SECURITY CLASSIFICATION Asistant Administrative Officer
FORM REPLAGESCD. OCr 49. WHICH WILL. DR USED DNTIL EXHAUSTED

JDHNT MESSAGEFOR SECURITY CLASSIFICATION
NUATION SHEET Undlassified
FROM:
COMDR, ATIC
Washington 25, D.C.
COORDINATION:
ArOIN-454B.h.Mily DATE 52258
Dr. Miley
HK Silhut imay
AFCIN-4E Colonel Gilbert DATE
Colonel Giibert
AFCIN-4X1 AFCIN-4X1 GrancileiD 6 tuay? GrancillheiDa 6tuay?
Mr. Arcier
SYMBOL NR PAGE NR OF PAGES SECURI Unclassified INITIAL
AFCIN-4E4g 2
DD: MOAM s173-1 U. S. GOVERNNENT PRINTING OFFICSI 1319--3522

1-)
RE003 4E4
0 SQB301 XYC885 XMB358ZCZCYBFA062 S
RR RJEDSQ RJEPHQ RJWFAM 4XE
DE RJWPBF 37A MEM
R 152230Z
FM COMDR AFFTC
TO RJEDSQ/COMDR AIR TEC INTEL CEN VPAFB
INFO RJWFAM/COMDR 10 IR INTEL SER SQUAD PETERSON FIELD
RJEPHQ/ASSIST CHIEF RJEPHQ/ASSIS CHIEF HQ USAF
BT ET
AFCIN-4E4
- 8 A
ITELLIGENCE (HQ USAF).
REFERENCE ATIC MESSAGE AFCIN-4E4-5-872-E. A U-2 AIRCRAFT, REFERENCE AT RAFT
ON A CLASSIFIED PROJECT FROM THIS CENTER, WAS IN THE ON A CLASSTFIED FROM THIS CENTER LAS TAT THE
GENERAL AREA ON DATE AND TIME INDICATED. A BALLOON WAS
SIGHTED BY THE PILOT. THE U-2 AIRCRAFT T DID MAKE A TURN
IN THAT GENERAL AREA.
BT
15/2234Z MAY RUWPBF
MEINN