SIOANI, the Sistema de Investigacao de Objetos Aereos Nao Identificados, was the Brazilian Air Force's formal system for collecting, investigating, and circulating reports of OANI, the service's preferred term for unidentified aerial objects.1 Brazilian government archive notices identify the SIOANI as a 1969 body created inside the Quarta Zona Aerea in Sao Paulo, now IV COMAR, and place its surviving records in the Arquivo Nacional's OVNI fund, produced by the Comando da Aeronautica.23
The Arquivo Nacional describes the OVNI fund as a large public record set containing reports, questionnaires, correspondence, photographs, drawings, videos, audio, and press clippings on objects observed in Brazilian skies.3 Its official notices say the material was transferred from the Centro de Documentacao e Historico da Aeronautica, can be consulted online through SIAN, and includes documentation spanning from early Cold War sightings through later Brazilian Air Force investigations.45
Origin and Mandate
The first SIOANI bulletin, dated March 1969, framed the program as a disciplined answer to a subject that had been distorted by sensational press coverage, hoaxes, and popular language such as discos voadores.6 Its authors deliberately used OANI instead, treating the phenomenon as something to be catalogued and researched before any extraordinary interpretation was accepted.6
The same bulletin defined SIOANI as a set of personnel and material resources devoted to the scientific investigation and research of unidentified aerial-object phenomena.6 It gave the Central de Investigacao de Objetos Aereos Nao Identificados, or CIOANI, an address at the headquarters of the 4th Air Zone in Cambuci, Sao Paulo, making the system a concrete military office rather than an informal interest group.6
The doctrine placed SIOANI directly under the Minister of Aeronautics while requiring the results of its work to be forwarded to the Estado-Maior da Aeronautica.6 A University of Brasilia historical study, based on the released Air Force files, treats SIOANI as the FAB's one sustained period of proactive field research on OANI, operating from 1969 until its closure in 1972.7
Organization
SIOANI's structure was deliberately modular. The CIOANI directed the system, while ZIOANI areas mapped investigation zones, NIOANI nuclei handled observations and material collection, LIOANI laboratories performed research or analysis, TIOANI arranged transport, and RIOANI used Air Force, armed-forces, police, radio-amateur, and other communications networks.6
The first bulletin specified that NIOANI could be run by people, corporations, military units, public institutions, aeroclubs, or other organizations incorporated into the system.6 It also required personnel to be credentialed by CIOANI and stated that military and civilian collaborators would work without special remuneration, alongside their normal duties.6
By March 1969, SIOANI listed activated NIOANI sites and cooperating organizations concentrated in Sao Paulo and nearby air-network nodes.6 By the August 1969 bulletin, the network had expanded to places including Campo Grande, Cumbica, Rio de Janeiro, Brasilia, Belo Horizonte, Recife, Salvador, Petrolina, and even Paris, France.8
Bulletins and Case Files
The March bulletin announced that SIOANI would circulate periodic reserved bulletins among approved agencies, institutions, and people, covering investigators, procedures, research status, results, and computations.6 It also prohibited sensationalism and said public conclusions or comments on investigations could be released only through CIOANI leadership, although selected information could be provided to accredited media.6
The August 1969 bulletin reported that the investigation area and the number of NIOANI and IOANI participants had grown during the five months after the first bulletin.8 It then published network rosters, statistical tables, and short reports for cases that had drawn CIOANI attention since October 1968.8
Those case summaries reached CIOANI case 070 and mixed ordinary lights, structured objects, alleged landings, close approaches, electromagnetic effects, and occupant claims.8 Brazilian UFO Archives, a private guide that cites the Arquivo Nacional/SIAN record BR DFANBSB ARX.0.0.59, cross-indexes the same 70-case bulletin as "Objetos Aereos Nao Identificados: estatisticas, boletim SIOANI."9
Method
SIOANI combined quick reporting with follow-up investigation. The first bulletin instructed local aviation-protection chiefs who learned of an OANI occurrence to designate a military investigator, contact one or more witnesses, complete the coded Mod. F 01 form, and transmit it to CIOANI by Telex.6
The standard OANI report form preserved by the SIOANI document set shows how broad the field questionnaire could become, collecting witness data, local conditions, observation details, object characteristics, objective corroboration, simultaneous events, and a final narrative appraisal.10 The instructions also told local personnel to preserve any material or traces left by an OANI for delivery to a CIOANI-credentialed investigator.6
In the August bulletin's closing discussion, CIOANI described an investigation flow in which NIOANI, PIOANI, IOANI, and other sources reported an occurrence, after which CIOANI decided whether deeper research was warranted.8 When it was, investigators examined people, things, and locations through a standardized but flexible procedure, with psychiatric evaluation given special weight in richly detailed cases.8
Statistics
The August bulletin's statistical tables show a program trying to quantify witnesses and environments, not only collect dramatic narratives.8 Through case 070, SIOANI counted 38 city observations, 12 site observations, 10 farm observations, and 10 village observations; it also recorded 42 night observations, 10 daylight observations, 9 dawn observations, and 9 evening observations.8
The witness tables captured social and psychological variables as well as sighting circumstances. They listed 21 witnesses with television access and 49 without, 64 male and 19 female witnesses, and schooling levels ranging from 8 illiterate witnesses to 11 university witnesses.8
Findings and Cautions
SIOANI's surviving bulletins do not read like a public declaration of extraterrestrial visitation. They read like an Air Force intelligence and research system trying to collect reports, screen credibility, preserve physical traces, coordinate laboratories, and avoid public embarrassment while keeping national authorities informed.68
The August bulletin explicitly accepted some cases because it found nothing that invalidated them, but it also identified others as likely voluntary ideation or cases involving schizophrenic, hallucinatory, or delusional personality evidence.8 That tension is the historical core of SIOANI: the Air Force treated the reports seriously enough to build a national reporting system, yet cautiously enough to keep conclusions reserved, procedural, and often unresolved.87
Legacy
SIOANI matters because its records make Brazil one of the clearer public examples of a national air force creating a formal UFO investigation apparatus with named offices, field forms, communications procedures, and published internal bulletins.268 The program's records later became part of the Arquivo Nacional's OVNI fund, whose government notices emphasize public access, online consultation through SIAN, and ongoing research use by historians and archive users.34