PROJECT 10073 RECORD CARD 12. CONCLUSIONS 2. LOCATION 3. OATETIM GROUP Was Balloon Probably Balloon Possibly Balloon :JJ Ground-Vi suol a Graul'ldRodor Was Aircrafr 0 Probably Aircraft 0 Ai,.Viwol 0 Alrlntercept Rooor a Po:uobly AltCToh 6. SOURCE 0 Was A strona..,lc:oJ .s. PHOTOS I 8. HuMaER 0 ,. OBJECiS 0 P robaOI y Asttono,..lc:ol Possibly Astrono..,lc:ol 7. LENGTH 0, OBSERVATION 0 lnsuflicienr Oato for Evoluotion Ill. S~IE, SUM.W.\~Y 01' SIGH TINO c~v~lop~d .ro~r0~s1vely with formatio. St:!'.;O.d tl"l..Ll d0v0l0p~d ATlC I'Ol'W J29 (l'&V 2 6 SllP !2) 11. COMMENTS .. n n.u.tne Subject: Gro:nd ob~er ... atioa oi u nusu.;.tl vapor t-:-e~. l s To: Commander Air Defence Command Ent Air Force Base Colo::-ado Springs, Colo. Date of observation: 1 6 July 1957 Time of obat!Tvation: 115 7 MST (1857 Greenwich) Location: Cheyenne, Wyoming Condition of s ky : Sca.tter~d broken clouds Point of observed trails: Near the zenith. in two a trata a.t 8000 and 15000 Description: Vapor trail arc d eveloped a s a. very faint and narrow trail. Pattern showed a full 180 degree turn and forme d in about t'.welve seconds. No plane o r objec t vhible ahead of trail~ Unuaual pattern developed from what a:n-eare d to be vapor traits which developed at right angles to e1e a::-c <U shown below. These cro2ea CI}Veloped progrea,ively with the formation of the trail but appea:-ed wider then the tr:1il itself. Within about a hal! minute a second trail developed moving f r o m west to east in a straight line. The traits illaappeared within five mlnute!l