Page:Project Blue Book, complete status reports.pdf/341

UNCLASSIFIED Calumet, Michigan

I. DESCRIPTION

On 20 April 1953 between 0118Z and O215Z a aeries of targets were sighted by the 665th AC&W Squadron, Calumet, Michigan. The plots originated approximately 50 miles from their station, from 050° clockwise to 251 Speed was from 1800 mph to 8400 mph. This sighting was a radar sighting only and appeared as a normal target except for speed. No abrupt maneuvers were noted. Several individual targets were noted. This squadron was using an AN/FPS-3 type Bearch radar unit, with a Thyratron modulator. There had been no maintenance difficulties. The general weather conditions at the time of sighting were three miles visibility, snow and overcast. Northern Lights were clearly visible during this period.

II.

This is another of the better type of FLYOBRPT. The intelligence officer is to be commended for the initiative shown In making as complete a report as was possible under the circumstances. He made the preliminary evaluation at the time he prepared the report, saving Project Blue Book the time and effort It takes to investigate a sighting of this type. His evaluation was. . . "Targets are believed to be interference from shipborne radar, originating on Lake Superior".

III.

Other (radar interference). 11

UNCLASSIFIED