The identities of the late officials are revealed in what conspiracists say is a leaked document from the US Defense Intelligence Agency (DIA) from the Eighties.

Yesterday, Express.co.uk revealed how the 47-page alleged “above top secret” file had been released and contained claims the 1947 Roswell UFO crash did happen, dead aliens were found and there was a major cover up to hide the truth.

The document is said to have been given to Heather Wade, host of US late-night online paranormal radio show Midnight in the Desert, from a known source who has not been named.

Many UFO experts have branded the document fake, but the release has set the conspiracy theory world on fire, with others convinced it could be genuine.

The document claims a highly secretive team of top scientists, government officials and military leaders – all now dead – was set up in the wake of the Roswell incident to investigate the “captured flying sauce remains” and “four dead aliens” and assess the risk to the planet of “visiting aliens”.

The document claims the group was called Majestic 12 and set up on the orders of President Harry S Truman, in the wake of Roswell.

It identifies these people as the original members:

*Lloyd Viel Berkner, an American physicist and engineer, who died in 1967 aged 62, and had investigated the Earth’s atmosphere.

*Detlev Wulf Bronk, another US scientist, educator, who died aged 78 in 1975, and was recognised for developing biophysics as an established science.

*Vannevar Bush, an American engineer and inventor and science, who led the US Office of Scientific Research and Development during World War II.

It carried out military research and development. He died aged 84 in 1974.

*Donald Howard Menzel, who died in 1976 aged 75, who was one of the first theoretical astronomers and astrophysicists in the US, and discovered the physical properties of the solar chromosphere, the chemistry of stars, the atmosphere of Mars, and the nature of gaseous nebulae.

*Hoyt Sanford Vandenberg, a US Air Force general, its second Chief of Staff, and second Director of Central Intelligence, who died in 1954 aged 54.

*Nathan Farragut Twining, who died in 1982 aged 84, who was Chief of Staff of the United States Air Force from 1953 until 1957, and during the Roswell UFO incident.

*Sidney William Souers, who died in 1973 aged 80, and was a former director of central intelligence, and the executive secretary of the National Security Council, before becoming special consultant to the President on military and foreign affairs from 1950 to 1953.

*Robert Miller Montague, a Lieutenant General in the US Army who was deputy commander of Fort Bliss, Texas and commander of the Sandia Missile Base in New Mexico, who died in 1958 aged 58.

*James Vincent Forrestal, who died in 1949 aged 57, and was the first United States Secretary of Defense.

*Gordon Gray, who died in 1982 aged 73, who was a defense and national security government official.

*Roscoe Henry Hillenkoetter, the third director of the post-World War II United States Central Intelligence Group (CIG), who died aged 85 in 1982.

*Jerome Clarke Hunsaker, who died aged 98 in 1984, and was from 1941 to 1956 chairman of the National Advisory Committee for Aeronautics.