usaf_f1.pdf

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Fact Sheet 
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· United States Air Force 
Secretory ot the Air Force. Otftce ot Public Arroirs. Washington. D.C. 20330 
INFORMATION OP ppos 
Thank you for your request for information on the Air Force's 
investigation of unidentified flying objects, or UFO's. 
The Air Force investigation of UFO's began in 1948 and was 
known as Project Sign. 
Later the name was changed t~ Project 
Grudge, and in 1953, it became Project Blue Book. 
Between 1948 
and 1969 we investigated 12,618 reported sightings. 
Of these sightings, 11,917 w…

Fact Sheet 
· United States Air Force 
Secretory ot the Air Force. Office ot Public Arroirs. Washington. D.C. 20330 
INfORMATION OP ppos 
Thank you for your request for information on the Air Force's 
investigation of unidentified flying objects, or UFO's. 
The Air Force investigation of OFO's began in 1948 and was 
known as Project Sign. 
Later the name was changed t~ Project 
Grudge, and in 1953, it became Project Blue Book. 
Between 1948 
and 1969 we investigated 12,618 reported sightings. 
Of these sightings, 11,917 were found to have been caused by 
material objects (such as balloons, sat…

In 1977, President Carter asked the National A~ronautics and 
Space Administration (NASA) to look into the--possibility of resuming 
UFO investigations. After studying all the facts available, NASA 
decided that nothing would be gained by further investigation. 
The 
Air Force agrees with that decision. If, how~ver, firm evidence is 
found justifying further investigation, an appropriate agency will be 
directed to undertake the effort. 
UFO SIGBTINGS BY YEAR 
UAR 
1947 
1948 
1949 
1950 
1951 
1952 
1953 
1954 
1955 
1956 
1957 
1958 
1959 
1960 
1961 
1962 
1963 
1964 
1965 
1966 
1967 
1968…

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