Documents / FOIA release
This undated Air Force UFO fact sheet, filed as Attachment 2 in an Office of the Secretary of Defense release, traces UFO investigations from Project Sign in 1948 through Grudge to Project Blue Book. It gives yearly sighting counts from 1947 to 1969: 12,618 reports in all, 701 of them still unexplained. It records that Blue Book was ended on December 17, 1969 and lists its three conclusions: no threat to national security, no technology beyond present knowledge, and no evidence of extraterrestrial vehicles. It also notes that NASA declined to resume investigations in 1977.
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 1,006 14 1958 627 10 1959 390 12 1960 557 14 1961 591 13 1962 474 15 1963 399 14 1964 562 19 1965 887 16 1966 1,112 32 1967 937 19 1968 375 3 1969 146 1 TOTAL 12,618 701 or these total sightings, 11,917 were found to have been caused by material objects (such as balloons, satellites, and aircraft), immaterial objects (such as lightning, reflections and other natural phenomena), astronomical objects (such as stars, planets, the sun and the moon), weather conditions and hoaxes. As indicated only 701 reported sightings remain unexplained. Attachment 2, pg 1
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FOIA release, from the osd collection. The PDF is mirrored here; the original link is above. 3 pages are in the text index: search them above, or from the library's search.