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Project Sign was an official U.S. government
U.S. government
study of unidentified flying objects (UFOs) undertaken by the United States Air Force
United States Air Force
and active for most of 1948. Project Sign's final report, published in early 1949, stated that while some UFOs appeared to represent actual aircraft, there was not enough data to determine their origin.[1] Project Sign was first disclosed to the public in 1956 via the book The Report on Unidentified Flying Objects by retired Air Force Captain Edward J. Ruppelt.[2] The full files for Sign were declassified in 1961.[3] References[edit]

^ Blum, Howard, Out There: The Government's Secret Quest for Extraterrestrials. Simon and Schuster, 1990 ^ Edward J. Ruppelt (1956). The Report on Unidentified Flying Objects, Doubleday & Co. online ^ Hoyt, Diana Palmer (2000). UFOCritique: UFOs, Social Intelligence, and the Condon Committee; Master's thesis, Virginia Polytechnic Institute and State University.

Further reading[edit]

Dolan, Richard M. (2002) UFOs and the National Security State: Chronology of a Cover-up 1941–1973, ISBN 1-57174-317-0 Peoples, Curtis (1994). Watch the Skies! - A Chronicle of the Flying Saucer Myth. Smithsonian, ISBN 1-56098-343-4.

External links[edit]

the Twining letter dod.mil (archived)

Preceded by None US military projects investigating the UFO phenomenon Succeeded by Project Grudge

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UFOs and ufology

Index of ufology articles

Incidents

General

List of reported UFO sightings Sightings in outer space

Pre-20th century

Tulli Papyrus (possibly 15th century B.C.) Ezekiel's Wheel (circa 622–570 B.C.) 1561 celestial phenomenon over Nuremberg 1566 celestial phenomenon over Basel José Bonilla observation
Bonilla observation
(1883) Aurora (1897)

20th century

Los Angeles (1942) Kenneth Arnold (1947) Maury Island (1947) Roswell (1947) Aztec, New Mexico (1948) Mantell (1948) Chiles-Whitted (1948) Gorman Dogfight (1948) Mariana (1950) McMinnville photographs (1950) Sperry (1950) Lubbock Lights
Lubbock Lights
(1951) Carson Sink (1952) Nash-Fortenberry (1952) Washington, D.C. (1952) Flatwoods monster
Flatwoods monster
(1952) Ellsworth (1953) Kelly–Hopkinsville (1955) Lakenheath-Bentwaters (1956) Antônio Vilas Boas
Antônio Vilas Boas
(1957) Levelland (1957) Trindade Island (1958) Barney and Betty Hill
Barney and Betty Hill
abduction (1961) Lonnie Zamora incident
Lonnie Zamora incident
(1964) Solway Firth Spaceman (1964) Exeter (1965) Kecksburg (1965) Westall (1966) Shag Harbour (1967) Pascagoula Abduction
Pascagoula Abduction
(1973) Travis Walton incident (1975) Allagash (1976) Tehran (1976) Petrozavodsk phenomenon
Petrozavodsk phenomenon
(1977) Operação Prato (1977) Valentich disappearance (1978) Kaikoura Lights (1978) Robert Taylor incident
Robert Taylor incident
(1979) Val Johnson incident (1979) Cash-Landrum incident (1980) Rendlesham Forest (1980) Trans-en-Provence (1981) Japan Air Lines (1986) Voronezh UFO incident (1989) Belgian UFO wave
Belgian UFO wave
(1990) Varginha (1996) Phoenix Lights
Phoenix Lights
(1997)

21st century

USS Nimitz UFO incident
USS Nimitz UFO incident
(2004) Campeche, Mexico (2004) O'Hare Airport (2006) Alderney (2007) Norway (2009) Morristown, New Jersey (2009)

Sightings by country

Argentina Australia Belarus Belgium Brazil Canada China France India Indonesia Iran Italy Mexico New Zealand Norway Philippines Russia South Africa Spain (Canary Islands) Sweden Thailand United Kingdom United States

Types of UFOs

Black triangle Flying saucer Foo fighter Ghost rockets Green fireballs Mystery airship

Types of alleged extraterrestrial beings

Alleged UFO-related entities Energy beings Grey aliens Insectoids Little green men Nordic aliens Reptilians

Studies

The Flying Saucers Are Real
The Flying Saucers Are Real
(1947–1950) Project Sign (1948) Estimate of the Situation Project Grudge (1949) Flying Saucer Working Party (1950) Project Magnet (1950–1962) Project Blue Book (1952–1970) Robertson Panel
Robertson Panel
(1953) Condon Report (1966–1968) Institute 22 (1978–?) Project Condign
Project Condign
(1997–2000) Advanced Aviation Threat Identification Program
Advanced Aviation Threat Identification Program
(2007-2012) Identification studies of UFOs

Hypotheses

Ancient astronauts Cryptoterrestrial Extraterrestrial Interdimensional Psychosocial Nazi UFOs Trotskyist-Posadism

Conspiracy theories

Area 51 Bob Lazar Dulce Base Majestic 12 Men in black Project Serpo

Involvement

Abduction

History Entities Claimants Narrative Missing time Perspectives Insurance

Other

Implants Close encounter Contactee Declassification of documents Government responses (GEIPAN) Organizations Ufologists Topics

Culture

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Skepticism

List of scientific skeptics Committee for Skept

.