2d_af_1.pdf

lo 
UFO FACT SHEET--
The Air Force investigation of UFO's began in 1948 and was known 
as Project Sign. 
Later the name was changed ~o Project Grudge, and 
·in 1953, it became Project Blue Book. 
Between 1948 and 1969 we investi-
gated 12,618 reported sightings. 
The following is a statistical listing or reported UFO sightings 
during the Air Force investigation: 
TOTAL UFO SIGHTINGS, 1947 - 1969 
YEAR 
TOTAL SIGHTINGS 
UNIDENTIFIED 
1947 
122 
12 
1948 
156 
7 
1949 
186 
22 
1950 
210 
27 
1951 
169 
22 
1952 
1 '501 
303 
1953 
509 
42 
1954 
487 
46 
1955 
545 
24 
1956 
670 
14 
1957 
1,0…

On December 17, 1969 the Secretary of the Air Force announced the 
termination of Project Blue Book. 
The decision to discontinue UFO investigations was based on an 
evaluation or a report prepared by the Univarsity of Colorado entitled, 
"Scientific Study of Unidentified Flying Objects;" a review of the Univer-
sity or Colorado's report ~Y the National Academy of Sciences; past 
UFO studies; and Air Force experience investigating UFO reports for 
two decades. 
As a result of these investigations and studies, and experience 
gained from investigating UFO reports since i948, the conclusions of …

Scientific Study of Unidentified Flying Objects. 
Study conducted 
by the University of Colorado under contract F44620-76-C-0035. 
Three 
volumes, 1,465 p. 68 plates. 
Photoduplicated hard copies of the official 
report may be ordered for $6 per volume, $1!-the set of three, as AD 
680:975, AD 680:976, and~ 680:977. 
Review of University of ~olorado Report on Unidentified 
Flying Objects. 
Review of report by a panel of the National Academy 
of Sciences. 
National Academy of Sciences, 1969, 6p. 
Photoduplicated 
hard copies may be ordered for $3 as AD 688:541. 
3 
Attachment 2, pg 
3