UFO spotted by B-47 pilot over Oregon

Summary

A pilot of a B-47 at Mountain Home AFB reported an unidentified object with a bright tail of 25 to 30 miles. The sighting occurred on September 23, 1963, with the object estimated to be 500-600 miles away, 20 degrees above the horizon. Although several explanations were considered, such as a balloon, aircraft, or meteor, no definitive conclusion was reached. Information on the duration and movement of the object was incomplete, complicating its evaluation.