Expediente Número 670603: Avistamiento de Fenómenos Extraños (Ovni) - Montanchez (Badajoz), 03 de Junio de 1967

This case file (Expediente 670603) documents an unidentified aerial phenomenon observed on June 3, 1967, over Montanchez, Badajoz, Spain. The incident began when a T-33 aircraft (Duende-20) from the Talavera Air Base, while flying from Torrejon, observed a bright, unidentified object at approximately 50,000 feet. The pilots reported that the object appeared to change shape—described variously as a deformed balloon, a pyramid, or two cones joined at the base—and seemed to ascend when they attempted to reach its altitude. The object exhibited little to no horizontal movement and caused radio interference when the aircraft passed beneath it. Radar stations (EVA 2 and EVA 3) confirmed the presence of a physical object. Subsequently, two F-86F aircraft (EL-01 and EL-02) were scrambled from Torrejon to intercept and photograph the object. The F-86 pilots also reported difficulty in reaching the object's altitude and noted its changing appearance and luminosity. Despite their efforts, including attempts to capture photographic evidence, the pilots were unable to identify the object or get close enough for a definitive assessment. The object was eventually classified as 'friendly' by radar controllers. The final intelligence assessment, dated July 1, 1992, concluded that the object was likely a weather balloon (globo sonda), noting that the perceived abrupt altitude changes were likely subjective impressions caused by the object's changing shape and size. The file includes transcripts of radio communications between the pilots and ground control, radar trace logs, and reports from the participating pilots. The document was declassified in 1992, with the recommendation that it no longer be held as confidential.