Documents / Report
This August 1949 technical report from the US Air Force Air Materiel Command presents Project Grudge's investigation of unidentified flying objects through January 1949. Drawing on consultants including Dr. J. A. Hynek, Rand Corporation, the Air Weather Service and Dr. P. M. Fitts, it explains most of 244 incidents as balloons, aircraft, astronomical phenomena, hoaxes or psychological errors. It concludes the objects pose no direct threat to national security and recommends reducing the investigation in scope.
The primary purpose here, however, is to aggregate individe which have a reasonable degree of certainty of astronomical origin. Therefore, in a second, more detailed breakdown, individe are placed in one of three classes, according to the most probable interpretation seen in the evidence offered (with a minimum of allowance for subjective observation). Class 1 includes the astronomical individe (with degree of probability indicated). The non-astronomical individe are divided into two classes, because it appeared as the work progressed that they fell naturally thus: in some, the evidence at hand suggested a simple explanation; in others, it did not. Listings under class 2 are not to be considered in any way decisive (with the exception of a few which, according to subject reports, have been definitely identified); they are offered as suggestions. A summary of the results of this breakdown is shown in the table on the following page.
Report, from the classic collection. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 413 pages are in the text index: search them above, or from the library's search.