Unidentified Flying Objects: Project "Grudge" (Technical Report No. 102-AC 49/15-100)

## PLY DIV 00JCT0.

## by

N. J. Valley, Joint Scientific Advisory Board,

Office of the Chief of Staff, United States Air Force.

The writer has visited summary abstracts and concents pertaining to unidentified flyin objects, which were forwarded by Air Force Intelligence. These remarks are divided into three main parts: The first part is a short summary of the reports; the second part consists of a general survey of various possibilities of accounting for the reports; the third part contains certain recommendations for future action.

## PART 1 SHORT SLEET OF OBSERVATIONS.

The re-arts are grouped as follons:

Group 1. The most numerous reports indicate the daytime observation of metallic disk-like objects, roughly in diameter twice their thickness. There is some suggestion that the cross section is asymmetrical and rather like a turtle shell. Reports agree that these objects are capable of high acceleration and velocity; they often are sighted in jellys, sometimes in formation. Sometimes they flutter.

Group 2. The second group consists of reports of lights observed at night. These are also capable of high speed and acceleration. They are less commonly seen in groups. They usually appear to be sharply defined luminous objects.

Group 3. The third group consists of reports of various kinds of rockets, in general appearing somewhat like 7-2 rockets.

Group 4. The fourth group contains reports of various devices which, in the writer's opinion, are sounding balloons of unusual shape such as are made by the General Hills Company to Navy Contract.