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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. SECRET – Information of which the unauthorized disclosure could reasonably be expected to cause serious damage to the national security.
For this reason, security clearances are required for a wide range of jobs, from senior management to janitorial. According to a 2013 Washington Post article, over 3.6 million Americans had top-secret clearances; almost one-third of them worked for private companies, rather than for the U.S. government. [32] [33]
SCI is not a classification; SCI clearance has sometimes been called "above Top Secret", [2] but information at any classification level may exist within an SCI control system. When "decompartmentalized", this information is treated the same as collateral information at the same classification level.
A Q Clearance is equivalent to a U.S. Department of Defense Top Secret clearance. [2] According to the Department of Energy, "Q access authorization corresponds to the background investigation and administrative determination similar to what is completed by other agencies for a Top Secret National Security Information access clearance." [2]
Top Secret is the highest level of classified information. [4] Information is further compartmented so that specific access using a code word after top secret is a legal way to hide collective and important information. [5] Such material would cause "exceptionally grave damage" to national security if made publicly available. [6] Prior to 1942 ...
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 ...
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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.