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DoD issues more than 80% of all clearances. There are three levels of DoD security clearances: [3] TOP SECRET – Information of which the unauthorized disclosure could reasonably be expected to cause exceptionally grave damage to the national security.
A Top Secret, or "TS", clearance, is often given as the result of a Single Scope Background Investigation, or SSBI. Top Secret clearances, in general, afford one access to data that affects national security , counterterrorism / counterintelligence , or other highly sensitive data.
After the United States entered into World War II, Britain changed its security classifications to match those of the U.S..Previously, classifications had included the top classification "Most Secret", but it soon became apparent that the United States did not fully understand the UK's classifications, and classified information appeared in the U.S.'s press.
The Washington Post reported in 2010 that there were 1,271 government organizations and 1,931 private companies in 10,000 locations in the United States that were working on counterterrorism, homeland security, and intelligence, and that the intelligence community as a whole would include 854,000 people holding top-secret clearances. [5]
In October 2017, more than 2.8 million people had security clearances — more than 1.6 million of them had confidential or secret clearance, and nearly 1.2 million had access to top secret ...
"Top Secret shall be applied to information, the unauthorized disclosure of which reasonably could be expected to cause 'exceptionally grave damage' to the National Security that the original classification authority is able to identify or describe." [27] As of 2019, around 1.25 million individuals have Top Secret clearance. [32]
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“These are contractors with top-secret clearances,” he said, emphasising the credibility of witnesses to the alleged sighting. “These guys are trained observers,” he added. “They’re ...