CIA-UAP-015, Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)

Reports of unidentified aerial objects have been received by the U.S. Air Force since mid-1947.

Reports of unidentified aerial objects (popularly termed "flying saucers" or "flying discs") have been received by the U.S. Air Force since mid-1947.

There was no evidence that unexplained reports of unidentified objects constituted a threat to the security of the U.S.

Although there was no evidence that the unexplained reports of unidentified objects constituted a threat to the security of the U.S.

The Air Force determined that all reports of unidentified aerial objects should be investigated and evaluated.

The Air Force determined that all reports of unidentified aerial objects should be investigated and evaluated.

The probability that any of the UNKNOWNS represented observations of technological developments not known to this country was very small.

This led to the conclusion that this probability was very small.

The study started in 1953 and the information cut-off date was established as of the end of 1952.

The special study which resulted in this report (Analysis of Reports of Unidentified Aerial Objects, 5 May 1955) started in 1953. To provide the study group with a complete set of files, the information cut-off date was established as of the end of 1952.

The 1953 and 1954 cases show a trend of increasing percentages in the finally identified categories.

The 1953 and 1954 cases show a general and expected trend of increasing percentages in the finally identified categories.

The revised program established by AF Reg. 200-2 improved reporting and investigating procedures.

On the basis of this, a revised program was established by AF Reg. 200-2 Subject: "Unidentified Flying Objects Reporting" (Short Title: UFOB) dated 12 August 1954.

The 4602d Air Intelligence Service Squadron would carry out all field investigations.

This new program...provided primarily that the 4602d Air Intelligence Service Squadron (Air Defense Command) would carry out all field investigations.

The number of unexplained cases has decreased rapidly towards the vanishing point.

As these impressions and interpretations have been replaced by the use of improved methods of investigation and reporting, and by scientific analysis, the number of unexplained cases has decreased rapidly towards the vanishing point.

It is highly improbable that reports of unidentified aerial objects represent observations of technological developments outside of the range of present-day scientific knowledge.

Therefore, on the basis of this evaluation of the information, it is considered to be highly improbable that reports of unidentified aerial objects examined in this study represent observations of technological developments outside of the range of present-day scientific knowledge.