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