Project Blue Book Case #9170. On November 14, 1964, witnesses in Menomonee Falls, Wisconsin — a suburb northwest of Milwaukee — observed a bright object in the evening sky. The object's luminosity and movement distinguished it from the familiar air traffic patterns over the Milwaukee metropolitan area.
Menomonee Falls sits in Waukesha County, approximately 15 miles northwest of downtown Milwaukee. The area's position beneath the approach corridors for Milwaukee's General Mitchell Airport and the busy Chicago-to-Minneapolis air routes meant residents regularly observed commercial aviation traffic. Their assessment that this object was anomalous reflected familiarity with what normal air traffic looked like.
November 1964 came during a period of heightened UFO activity following the famous Socorro, New Mexico, encounter in April. The autumn had produced a cluster of reports from the upper Midwest, continuing a pattern that would intensify dramatically in the spring of 1966.
The object exhibited characteristics that set it apart from conventional aircraft — its brightness exceeded aircraft navigation or landing lights, and its movement pattern did not conform to any standard approach, departure, or en-route flight path. No sound was associated with the object despite its apparent proximity.
Flight records for the Milwaukee area, including military operations from nearby bases, were checked without finding a correlation. The case was classified "Unknown."