Air Intelligence Information Report: Sightings of Unidentified Flying Objects in Argentina

This document is an Air Intelligence Information Report (IR-121-58) dated 5 March 1958, originating from the Air Attaché in Buenos Aires, Argentina. It transmits translations of communications provided by the Argentine Air Force regarding sightings of unidentified aerial objects. The primary incident occurred on 10 November 1957 at approximately 2250 hours in the vicinity of Huacalera, Jujuy (24°43'S; 65°16'W). A report from the 2nd Mountain Detachment described a luminous, conical object moving from north to south before turning west and disappearing behind a mountain range. The object was visible for five minutes and was described as having a luminosity greater than a first-magnitude star. The document also references two subsequent telegrams from December 1957 regarding other sightings, including one from a control tower at an unspecified location. The official conclusion recorded on the Project 10073 record card suggests the object was a 'possible satellite.' However, the document contains significant handwritten marginalia from an evaluator, which challenges this conclusion. The evaluator notes that the reported maneuvers are inconsistent with satellite behavior and that the available data is insufficient for a proper analysis, explicitly stating that the object was 'not satellite' and 'not a/c' (aircraft). The report serves as a record of international cooperation and intelligence sharing between the United States and Argentine military forces during the late 1950s regarding UAP sightings.