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23 July 1952 · South Bend — the sister city's ground
At 11:35 p.m., in the middle of the greatest flap month of the whole Blue Book era — four nights after the first Washington National Airport radar-visual weekend — United States Air Force pilot Captain H. W. Kloth, over South Bend, watched two bright blue-white objects fly together for about nine minutes, until the rear object veered off. That is this section's whole narrative, from Don Berliner's compilation of the unexplained cases read directly from the Blue Book microfilm at the National Archives, and its disposition is the strongest the system gives: the case stands in Project Blue Book's own list of cases officially carried as Unknown — the county's one official Unknown in the entire 1947–1969 file. A trained Air Force pilot, two objects in company, nine minutes, no identification the Air Force would sign. Placement: South Bend's sky, the sister city's ground; and the verdict discipline of this section requires the sentence whole — “Unknown” is this section's word for unexplained on the evidence in the file, and it is printed as exactly that, not as a word more.
From Don Berliner's compilation of the Project Blue Book unexplained cases (Fund for UFO Research; NICAP, “The Project Bluebook Unknowns”), entry of 23 July 1952, South Bend, Indiana.