What UFO researchers mean by "disclosure" is that "the governments reveal what they know about the UFO phenomenon to the general population".
What has been undertaken in various countries?
- Australia: between 1982 and 1984, invesigator Bill Chalker examined the majority of the UFO files held by the RAAF at the Directorate of Air Force Intelligence offices in Canberra. He also reviewed the UFO files held by the Department of Aviation, in Melbourne. Chalker has extensively reported on his findings over the years.
Most UFO files and case reports from 1950 to 1984 are available from the National Archives of Australia.
Since 1994, "officially" the RAAF doesn't investigate or collect any more public reports.
- Belgium: following the large number of UFO reports over Belgium in 1989-1990, the Belgian Air Force worked together with the federal police and the civilian ufologist group SOBEPS. Press conferences were given by the Air Force and several official reports were published.
- Brazil: in 2010, the government has ordered its air force to officially report all UFO sightings. Military and civilian pilots as well as air traffic controllers must register UFO sightings with the national aerospace defence command. The information is made available to researchers.
- Chile: in 1997 CEFAA was created, tasked with investigating UFO incidents. Their committee includes representatives from the Chilean Air Force, Army and Navy, as well as representatives from the Public Safety and Transport Department, Air Accident Investigation, aviation, Air Traffic Control, and a range of sciences. CEFAA is assisting other South American countries to establish similar research organisations to collect and investigate UFO sighting reports.
- France: in 1977 a study group for Unidentified Aerospace Phenomena (GEPAN) was established as a department within the French Space Agency (CNES). In 1988 GEPAN was replaced by a group called the Atmospheric Re-entry Phenomena Expertise Department (SEPRA). In 2006, SEPRA was replaced by GEIPAN (Groupe d'Etudes et d'Informations sur les Phenomenes Aerospatiaux Non-identifies). In March 2007, GEIPAN started to make its archives available online.
- Italy: in 1978 the Italian Ministry of Defence released a file containing six unclassified reports made by military personnel in 1977.
- New Zealand: The New Zealand Defence Force (NZDF) says they do no longer investigate sightings of UFO's, and all sightings reported to NZDF are handed to New Zealand Police or to civilian UFO groups.
The NZDF released its UFO files via the Internet during 2010 and 2011. This followed lobbying by UFO groups since the 1980s. The released material is highly disorganised. Most probably, there has never been a concerted or consistent effort by NZ Defence to seriously investigate the UFO phenomenon. Any "official" efforts have been undertaken (somewhat reluctantly) to calm the general public.
- United Kingdom: UK military personnel had observed and reported UFOs. The UK Ministry of Defence did have an interest in UFO reports. In 2010, thousands of previously classified documents on UFOs have been released by the Ministry of Defence.
- USA: the US Freedom of Information Act came into being in 1966, and UFO researchers made use of it to request UFO related documents from the US Air Force, the Federal Bureau of Investigation (FBI), the Central Intelligence Agency (CIA) and the National Security Agency (NSA).
By the late 1980's, some 30,000 UFO related documents had been released. However, most Defence Intelligence Agency (DIA) and NSA material was withheld.
The Pentagon confirmed that there was a $22 million government programme to collect and analyse "anomalous aerospace threats" between 2007 and 2012.
- Spain: in 1976 staff of the Spanish Air Ministry handed a file to a journalist which contained 12 of the country's most outstanding UFO cases.