afUFOsandUAPsf1.pdf

AFSINC/11 August 1985 
LF'O FACT Sl-EET 
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The Air For_ce investigation of UFOs began in 1248 and was known as Project Sign. 
Later the name was changed to Project Grudge, and in 1953 it became Project Blue Book. 
Between 1948 and 1969, the Air F-orce investigated 12,618 reported sightings. 
The following is a statistical listing of reported UFO sightings during the Air Force 
investigation: 
LF'O SIGHTINGS I 947 - 1969 
YEAR 
TOTAL SIGHTINGS 
l,J\.IIDENT I FlED 
947 
122 
12 
948 
156 
7 
949 
186 
22 
950 
210 
27 
951 
169 
22 
952 
1,501 
303 
953 …

.. 
On Dece~~e~ 17, 1969 the Secretary of the Air Force announced the 
termination of Project Blue Book. 
ThP decision tO discontinue UfQ i~Vestigations was based On an 
evalYation of a report prepared by the Unive~sity of Colorado entitled, 
"Scientific Study of~nidentified Flying Objects;" a review or the Univer-
sity of Colorado's report by the National Academy or Sciences; past 
UFO studies; and Air Force experienc~ investigating UFO reports for 
two decades. 
As a result or these investigations and stu·~ies, and expe~ience 
gained fro~ investigating UFO reports since ,948, the conclusions…

S'ientifi: ~tudv or Un1denttf1ed Fl in 
Ob ects. 
Study conducted 
by tne !Jniversity of Colorado under contract F4~ 20-76-C-0035. 
T~ree 
volumes. 1,465 p. 68 plates. 
Photoduplicated hard copies or the official 
;e~~~t m3Y h~ ordered fo~ $E per volume;-$18 the set of three, as AD 
GS0:97~, AD 680:976, and AD 680:977. 
~eview of Universitv of Colo~ado ~epo~t on Unidentified 
Flving Objects. 
Review of report by a panel or the National Academy 
nf Sciences. 
National Academy of Sciences, 1969, 6p. 
Phot~~uplicat~d 
h~rd copie~ may 
h~ ordered for $3 as AD 688:541.