中國(guó)網(wǎng)站品牌欄目（頻道）
A newly declassified CIA document confirms the existence of famed Area 51 in Nevada, but conspiracy theorists will be disappointed that the spy agency offers no proof of alien spaceship landings in the desert.
Area 51 has long been fodder for science fiction films and wild UFO tales claiming the US government imposed secrecy over the site northwest of Las Vegas to cover up evidence of extraterrestrials touching down on Earth.
Instead of encounters with flying saucers, the documents released by the CIA on Thursday recount a less sensational history of Area 51 - as a testing range for the government's U-2 spy plane during the Cold War.
The CIA in-house history makes no mention of the legendary "Roswell incident," when a weather balloon crashed in New Mexico in 1947. UFO true believers allege it was an alien spacecraft that went down, and that Area 51's hangars had hidden evidence of extraterrestrial corpses.
But according to the CIA, the government secrecy surrounding Area 51 was not about Martians but about hiding a new spy plane from the Soviets.
The U-2 reconnaissance aircraft was designed to snoop on the former Soviet Union at high-altitude, and its development was top-secret.
In April 1955, the CIA chose a remote dry lakebed in the Nevada desert as a testing ground, which was designated on maps as Area 51.
Test flights for the U-2 aircraft were conducted at a much higher altitude than commercial airliners or other military planes.
Reports of unidentified flying objects in the Nevada desert started to roll in, the report said.
"High altitude testing of the U-2 soon led to an unexpected side effect - a tremendous increase in reports of unidentified flying objects," it said.
The reports of UFOs often came from pilots from commercial airliners in the early evening hours, with the U-2 plane's silver wings reflecting the rays of the sun.
The surveillance planes appeared to be "fiery objects" high in the sky, it said.
"At this time, no one believed manned flight was possible above 60,000 feet, so no one expected to see an object so high in the sky," it said.
The commercial pilots and other observers on the ground wrote letters to an Air Force unit in Dayton, Ohio, charged with investigating such sightings.
Anxious to avoid exposing the ultra-secret U-2 program, Air Force officers explained the sightings as merely due to natural phenomena, though they knew the high-flying U-2 was the true cause.
U-2 and other surveillance flights "accounted for more than one-half of all UFO reports during the late 1950s and most of the 1960s", it said.
The 400-page report, titled "Central Intelligence Agency and Overhead Reconnaissance: The U-2 and Oxcart Programs, 1954-1974," was released as a result of a Freedom of Information request dating to 2005 from the National Security Archives at George Washington University.
The study was published in classified form for spy agencies in 1992 and a heavily censored version was published in 1998.
Area 51's location has been an open secret for years but government documents released previously had not acknowledged its existence and role in such a detailed way. Officials also had referred to a location "near Groom Lake".
The CIA report said at the time officials decided to nickname the site "Paradise Ranch" to make it sound more attractive to potential workers.
（中國(guó)日?qǐng)?bào)網(wǎng)英語(yǔ)點(diǎn)津 Helen 編輯）
About the broadcaster:
Lance Crayon is a videographer and editor with China Daily. Since living in Beijing he has worked for China Radio International (CRI) and Global Times. Before moving to China he worked in the film industry in Los Angeles as a talent agent and producer. He has a B.A. in English from the University of Texas at Arlington.
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