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Area 51 is the common name of a highly classified United States Air Force (USAF) facility located within the Nevada Test and Training Range. Officially, the facility is called Homey Airport or Groom Lake, named after the salt flat situated next to its airfield.
Although details of the facility's operations are not publicly known, based on historical evidence, it is most likely a training range that supports the development and testing of experimental aircraft and weapons systems. The USAF acquired the site in 1955, primarily for flight testing the Lockheed U-2 aircraft.
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The intense secrecy surrounding the base has made it the frequent subject of conspiracy theories and a central component to unidentified flying object (UFO) folklore.
The base has never been declared a secret base, but all research and occurrences in Area 51 are Top Secret/Sensitive Compartmented Information.
The CIA publicly acknowledged the existence of the base for the first time on 25 June 2013, following a Freedom of Information Act request filed in 2005, and they declassified documents detailing the history and purpose of Area 51.
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Area 51 is located in the southern portion of Nevada in the western United States, 83 miles (134 km) north-northwest of Las Vegas. The surrounding area is a popular tourist destination, including the small town of Rachel, Nevada on the "Extraterrestrial Highway".
The perimeter of the base is marked out by orange posts and patrolled by guards in white pickup trucks and camouflage fatigues. The guards are popularly referred to as “camo dudes” by enthusiasts. Signage around the base perimeter advises that deadly force is authorized against trespassers.
Technology is also heavily used to maintain the border of the base; this includes surveillance cameras and motion detectors. Some of these motion detectors are placed some distance away from the base on public land to notify guards of people approaching.
Source: Wikipedia
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