[ILLEGIBLE], [ILLEGIBLE] - Incident Number: 213Date unknown

The OCR text provided is largely illegible and severely degraded across multiple pages. While scattered fragments mention locations including Ohio, Dayton, and references to Incidents 212 and 213, and while some pages contain more readable memo text discussing weather balloons and aircraft observations from December 1948, the core incident details are too garbled to reliably extract and summarize with accuracy.

On December 3, 1948, observers in the Dayton, Ohio area reported sightings of lights in the sky. Air Force investigators examined whether the sightings might have been caused by a B-29 aircraft with landing lights, a weather balloon, or other conventional explanations. Dr. J. Allen Hynek's evaluation notes appear in the case file, along with assessments from the Air Weather Service. The full case file is reproduced below as held by the National Archives across 17 pages of microfilm.