The RB-47 UFO Incident 1957 — 700-Mile Radar and Electronic Pursuit

The RB-47 and Its Electronic Intelligence Mission

The Boeing RB-47H was a highly modified variant of the B-47 Stratojet designed specifically for electronic intelligence gathering. Unlike standard bomber aircraft, the RB-47H carried three electronic countermeasures officers in a purpose-built pressurized compartment in the bomb bay. These officers operated specialized receivers capable of intercepting and analyzing radar emissions across a wide frequency spectrum — the kind of equipment designed to detect Soviet air defense radars. The six-man crew included the three standard flight positions (pilot, co-pilot, navigator) plus the three ECM operators.

On July 17, 1957, the aircraft departed Forbes Air Force Base, Kansas, on a training mission over the Gulf of Mexico. The crew involved was experienced: aircraft commander Major Lewis Chase had extensive time in type, and the ECM officers were qualified for operational intelligence collection. The mission routing took the aircraft south over the Mississippi River delta and the Gulf, with planned return north through Texas and Kansas. What happened during the return leg became one of the most technically documented UAP cases in the official record.

ECM Detection, Visual Contact, and Radar Lock

At approximately 4:00 a.m. local time over Mississippi, ECM officer Captain Donald Tiegland detected an active radar emitter source in a frequency band consistent with an airborne pulse radar. The signal was directional, originating from a source at the RB-47's altitude at roughly the 11 o'clock position. This was unusual: the RB-47 was in a training area with no scheduled military exercises involving airborne radars in the area.

Major Chase visually acquired a large, bright white-blue light source at the detected bearing. The co-pilot, Captain James McCoid, also confirmed the visual contact. As the aircraft turned toward the contact, the ECM readings showed the emitter source maintaining bearing — meaning the source was maneuvering to maintain its relative position. Over the following 90 minutes, the contact was tracked continuously through multiple phase changes: the object closed on the aircraft, paced it at equal altitude and speed, circled around the aircraft's track, and on one occasion disappeared from both visual and ECM detection simultaneously, then reappeared at a different bearing. The disappearance and reappearance was instantaneous — not a fade consistent with increasing distance.

The Duncanville Radar Confirmation

At approximately 10:39 a.m. Central time, as the RB-47 crossed northern Texas, the crew contacted Duncanville Air Force Base Ground Controlled Approach radar. The Duncanville controller confirmed a return at the reported bearing of the contact — independent of the aircraft's own radar and independent of the ECM detection. For a brief period, the RB-47's radar, the ECM equipment, and the Duncanville ground radar were simultaneously showing returns consistent with the same object relative to the aircraft's known position.

The triple-simultaneous detection — ECM intercept, airborne radar, and separate ground radar — is the technical foundation of the RB-47 case's significance. Each detection system operates on different physical principles: ECM detects emitted radar signals, airborne radar returns energy reflected from a solid object, and ground radar independently tracks from a different geometric perspective. For all three to simultaneously show the same contact at consistent relative bearings implies a solid, radar-reflective, radar-emitting object — and eliminates the explanations of sensor artifact, single-instrument error, or pilot misperception. The Condon Committee's own reviewer, noting the triple simultaneous confirmation, concluded the case was genuinely unexplained by any conventional aircraft, atmospheric phenomenon, or equipment malfunction.

The Condon Report, Classification, and the 2026 Archive Release

The RB-47 case was submitted to the University of Colorado UFO Project (the Condon Study) by the Air Force in 1967 as one of the most technically complex cases in the Blue Book file. Physicist James McDonald — one of the most rigorous scientific analysts to examine Blue Book cases — independently researched the RB-47 incident and concluded it was, along with the Gorman Dogfight and the 1952 Washington DC radar cases, among the most compelling technically documented UAP cases in the official American record.

The Condon Report's section on the RB-47 case (written by Dr. Gordon Thayer) concluded the incident was 'not explained' after reviewing all available evidence. This designation in the Condon Report is significant because the study's general bias was toward skeptical conclusions — finding a conventional explanation wherever plausible. An 'unexplained' ruling from the Condon Committee represents a higher evidentiary threshold than the same designation from Project Blue Book.

The 2026 NARA archive release added the intelligence report component of the case — the ECM officers' technical log and the NSA communications intercept record from the Duncanville radar confirmation period. The intelligence report confirms the frequency parameters of the emitter detected by the RB-47's ECM equipment. The case is indexed as file DOD-021 at nowdeclassified.com/incidents/rb47-1957.