PROJECT 10073 RECORD CARD 2. LOCATION 12. CONCLUSION$ 0 Was Balloon _ 13 May 19_5_5 . Duluth, Minnesota _ o Probably Balloon LENGTH OP OBSERVATION tO. BRIEP SUMMARY OF SIGHTING rrwo AF pilots on A/I ATIC FORM 3l9 (REV 26 SltP S:Z) 0 Ground Vi suol 0 Air-Visual NUMBER OP OBJECTS 0 Ground-Radar XXAirlnterc:apt Radar 11. COMMENTS 0 Was Ahcrah 0 Probably Aircraft r:txPouibly Alrerah 0 Was Astronomical 0 Probobl y Astronomical 0 Po ssi bl y Astro"omicol 0 Insufficient Data for Evoluotton mission locked on See case file and evaluation rendered this incident by WADC. Evaluated as ;tel DISPOSITION Fa ' r I l.E N_,, SUBJEG:T . Air Intelligence Infor~ati~n .Report FROM ~/C.LGF-2 DATEfl ~/'"I I -~!'T:-.I Cno"t Hardin 1. !ieferencd is:nade to r..F Foz1n 112, Subject, "UFOB," dated 17 !<3y 1955 and ori~ inaced by the In-+;alligence Officer, ll"th Fighter Intercept er Squadron 2 . ./eapons Guidance LaboratOrJ c~ents on refarenced report are as follmvs: a . Bas~d on the vectoring a nd range data contained in thd report, a plot (.Ji6ure I) of the intercept shot~s tha t the target c culd n:;.ve bee.a an aircraf t of s i mi- l::ir ,3r f or:nance to modern jet nircra.ft. Durin~ tha intercep t tbe target i.vas e:~ecuting a tibht tu1.n to s tc::.rboard. b. For a portion of the targets turn to s te.:rbo2.rd, t~e interceptor and tar- t!;S"t \-H~re flying approxima. tely pa rallel (Fi~.lre I ,D) a t a bout thtJ aame v e l ocity. :ii th the tR~get a t 35 degrees Gtarboard 3nu flying ~rallel to the intarce~tor, tn~ terget iJould a ppear as a stationary return on "t:la HO' s scope. c. It is doubtfUl that t:~e pilots indic etor or tie RO' s s.co;>e could. be used t o acc~ataly measure t~a 1000 knots reportei s peed of t~e t arGet as it wes Dving o~t ln .cange. 'rhe ma..~in:tun opening range rate that can be observed from t!"le range r~te gap oa tae pilots indicztor is 200 knots . Th~ fire control syst~ specification re~uires t~a.t the system saould be able to measUIe range r ata frcm 1290 knots closing to 200 knots opening r e rate. d. Another possible explanation of the reported speeu of the target as it went out in range is that the interceptors radar j~nped lock . For a short period of tjme ana with a slight misalignment of the system. t he radar could apfear to be lockeu on to the target 1tihile actually the radar had jmnp e d lock. Under t hase conditions~ the return on the scopa could move in such a manner that the RO would believe that ~he. return was a target. e. The reported elevation angles of tha target as i t ~as goi~g out in range at lCCO ~mots are considered to b e a-;;pro:cimate. as only the a f prc:hir:-ate elevaticn. ~ngles of the .;nteih'13 are indica tad by the pes i tion of the e l evc. ticn mc.rksr at the ribht edge of th3 RO's scope. Also , because the indicated elev~t:on anele is ~easur~d ,;i t h r~spect to the intercepter heading and n e t wi t~1 l''3S_;>ect tc ground coor d i:12 tes, a diving or climbing attitude of t~e interceptor iTOuld result in a corre ondi~G incrae3 or d~crease of the eldvation angla. 1 .. l:.;t Ind fr _51.5th Air .I:ef Gp dtd 2]Jun55 2 . l~t Ind fr 4602d nir Intel JY.eapo.o.s (~llca:.ln~c L~oorarory 0 .-wzz IW !0 0 l ~::e 9 6 RVLA.CU NM. J'OJtM ae, t OCT. -4, WHICH MAY K uaco AIR TECHNICAl. INTELLIGENCE CEi,{Tf:. R W RIOH T-P A T'f E I! SON AI~ FO .-~r:E n., ')~ SUBJECT: (Uncl) Request J.'or Additional Information TO: Commander 515th Air Defense Group Duluth Municipal Airport Duluth, Minnesota 1. Reference M' Form 112, subject: UFOB, dated 17 Nay 1955 and originated by the Intelligence Officer, 11th Fighter Interceptor 2. In order to facilitate an accurate analysis of the report, request the ere,., of aircraft :, 32525 be re-interrogated as to whether or not the target return was intermittent or steauy Gf JfTP' "Juluth 'unicipal J\.irport, Dulu ch _ ii1u1e so t a TQ: CoJE:landcr, ldr 'i'echnical I~1t0lli~cnce G"nt~r, /righ't-?attersor.. .'D.r iorcc Dase, Ohio Cre\-1 o f aircraft .i32)25 report t0.a~ tar2;et :cturn u~ .. s rj ,03.dy f o; full p Jr lO-. o. scop....! C0\Ti.~ro~e. ArJjuta1TC C/T.t,r Hq 515t!1 AD~:i'C':ru, Dnluth Lun J\prt, ::irln, Snbj: 1'r~ns of Intel Ir...fo }!'r ... \.lJt ~rAHT L~lS, Color~. do ~n~:i_ncs, Color(I~O l .Hf'! I~!S~ Co;.rnander ATIC., A'rr .. r.r: Da~,iton, Chio 1 . 'l!'le i.nclosP.d r,rel iJn.i.na:!. .. .J U _i'C:3 repo:::t is tr:1ns:1itted for vour i nformation. The n a t11re of t 1-:ir. si-htin~ ~-~ SIH~h thR t, vour or~n!iization is pr0 )abl y b stt0.r eq,llryryed to handle it. 2. This or~ .. rlnization resulti'!"!g in no indication ~hec~:e<i 1; it~ t h e 3rd ~ieatl~-r <::r o1lp, A JS, of l..'eHt.:13r uhenomena crt. the t:!.me r1nd occ. :ton o S:J.[; . . l-J.ng Ht1J.c n miE.:ht help to ezpl::1in t h i::; rcnort. AP FOIM lt2 ~IJUNit .. C:OUin'R't AIR INTELLIGENCE INFORMATION REPORT DAT! Of ltUQ~ ,. c. DAT!,O' INfORMATIP~. ,. r.. EVALUATION PREPARED IY ,{0~) \.PP ?/Lt A t I t 11 ... ' . SOU~E r cH .. 0 por R -; ,..,.,, cltrtdiN, Jl'MOU ffllrt, de., ftl .,_, fftl6,.) Ap~novin,6 Jff'icer: l s t Lt. U3A.: OISTRI8VTION BY ORIGINATOR ''"'"CJ THIS DOCUMENT CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE OF THE UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE ACT, 50 tJ. S.c.- AND 32. AS AMENDED. ITS TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER TO AN UNAUTHO~IZEO PERSON IS PROHIBITED BY LAW. " --.... 0 IM WHOLE OR IN PART, DY OTHER THAH UNITED STATD AIR FORCE AGENCIES, EXCEPT BY PER\tiSSION OF THE DIRECTOR OF AF fORM 112-PART II (CLA~SIFIC"ATION) APPROV0 1 JUNE 1948 AIR INTELLIGENCE INFORMATION REPORT R EPORT NO. ~cocriptloa Jf c~ur$e! turnt:d 45 C.CJI'UclS s ;..o.COJ~l.TCi n .. ld loc.&Jd o~:i :'CT; Ol1 .. U' s ~e / . .);:! 0 rarr,~et .no-,ed 07~r t o 2J :~uc;rl!cS f:car st9..1' L>o3rc1. .:;tlll TC a t:ing l~vel, ():JJ ~c -~ then c ::t:-:a 0.-T.J:l i}1r3 s8ope l'arg.::t \-Ias do pilot :.ngan flyir~ th~ doto .l.arGet c ontinued dot,jn 3t 35 degr!!'es a:.ar- bua:rd to t.,, OJO y:J.:ds Cl:K1 EGO..):;ec.~ ~.:!aq., IJ i~-::::o:.:cli:.;tt..;l; -J-!E;an z:>i!1g ou=-. in ranJ3 L::!.Bter thc.a it. ca.:::! in (Gtayi~1g v;~ry cl!JSd to 35 < :;l'')es s ~ar fro:il l~vel t~ J O ~egrees a~vYe. Pilot' 3 ti. :~--0o-c;o '~irclc \-i~nt f l'O'"':l :1 oou t 8 o r t 0 n s-~conc.s to o.0out 2J ~-:...:cOl!.d3 o ./ro::1 t~ :; point ~,.,:'1~ro the :;:~r'\ight :1:ld l e ,el flight Hir.h a consta~t tru~ airs9~ed of about Y/5 knots at 26,000 fe-3t. .:~ took a h:J.rd p:>rt -G_;:-n u'1-~:l chis indic3.tion .;a::; at. abou c 9 1d.le s ( JO d,:}~re~s u,:~ove) <1:Y.l l t uent o~.f the SC:')ye o~ ( et) \ir-t:lc~tlunic: .:.f'~r-40; lust h ... adiL"L~, HOrl: THIS lXX:U'-'F.I'tfCONT 41Nc; INFORftltATION AFFF.CTING rHF. N 4TIONAL OEFF.NSEOF THE lll't iTF.O STAT;:'" '.NTL4W rw .................. _., ~"'' ..... .: ~ ---T 10011. S.C.- .il AH D 3?.. AS AMENDF.D. ITS TRANSMISSION 01-t T HE HF.VELATION ,,_ lT '-' 4Y t40T BE REPRODUCED I N WHOLE OR I N PART .... tj_-.1..')-' I NTEL LIGENCE. USAf . -'f ' AF FORM 112-PART II APPROVED 1 JUNE IMI (CLAS!III'lCA n OM) AIR INTELLIGENCE INFORMATION REPORT FROM (. \gmc' ) REPORT NO. lith f .I.s. 3 J PAGE OF PAG~.S Obs4!tr,rer s l (b) Hiddleton, Charles H., 1/Lt. 11t h FIS, Pilot (blterceptor) Completel.7 reliable . Fisher, Donald G., 2/Lt . 11th !t'!S, Fndar Observer Completely 1 eliable (b) Surface: {_c) Clear rio infornation as to o.ny unusual activity has been received. P..e:fer to 2d Northwest at about 50 miles the1e \.Jere t"Wo alrcraft running interceptions. Prepared qy the Assistant Intelligence Officer, 11th F.r.s. No suggestions given as to the possible cause of the sightings. -Ji;DWAF.D A. RAPP Asst. Intell. Officer HOlE: THIS IXX:U ~FN r CONTAINS INFORMATION ~FFCTING T HE NATIONAL OFFENSE 0~ THE UN I TEO STATES W,. 31 AND 12. AS AMF.NDEO. ITS TRANSMISSION OR THE RfVELA rJON OF Irs CONTENTS IN ... y M~'f NOT BE REPRODUCED IN WHOLE OR IN PART. l:iY OTHER THAN UN I t!Tt-.LLIGENCE. IISAF. JOB Nb . . . SUBJEC T . .. . . g 'wl\f~C,,