REF: UAP/1950s/045Unexplained
1953-08-05
Ellsworth AFB case
Blackhawk / Rapid City, SD · USA·Radar-visual with intercepts·1950s
Unexplained
§ ASummary
Ground observers and radar tracked a light; two F-84 intercepts — object outran and circled behind one jet; Ruppelt called it among the strongest cases.
§ BWitnesses
GOC spotter; radar crews; 2 F-84 pilots
§ CEvidence & Documentation
Radar tracks; pilot debriefs
§ DOfficial Investigation
Project Blue Book
§ EStatus Assessment
Officially unexplained (Ruppelt: 'unknown')
§ FVerifiable Sources
Ruppelt (1956); Blue Book files
§ GCross-referenced cases6
1951-08-25🇺🇸 USA
Lubbock Lights
Photographic / mass sighting
1951-09-10🇺🇸 USA
Fort Monmouth radar-visual
Radar-visual
1952-07-14🇺🇸 USA
Nash-Fortenberry sighting
Airline crew sighting
1952-07-19 & 26🇺🇸 USA
Washington D.C. radar incidents ('Washington flap')
Radar-visual over capital
1952-07-02🇺🇸 USA
Tremonton, Utah film
Film
1952-09-12🇺🇸 USA
Flatwoods 'monster'
Close encounter / entity report