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Security clearances can be issued by many United States of America government agencies, including the Department of Defense (DoD), the Department of State (DOS), the Department of Homeland Security (DHS), the Department of Energy (DoE), the Department of Justice (DoJ), the National Security Agency (NSA), and the Central Intelligence Agency (CIA).
A Secret clearance requires a NACLC, and a Credit investigation; it must also be re-investigated every 10 years. [24] Investigative requirements for DoD clearances, which apply to most civilian contractor situations, are contained in the Personnel Security Program issuance known as DoD Regulation 5200.2-R , at part C3.4.2.
Top Secret is the highest level of classification. However some information is further categorized/marked by adding a code word so that only those who have been cleared for each code word can see it. A document marked SECRET (CODE WORD) could be viewed only by a person with a secret or top secret clearance and that specific code word clearance.
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.
There's a lot more secrecy in U.S. politics than we think -- and that also extends to the protection of the nation's most powerful leaders. When John F. Kennedy began his presidency at the height ...
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SI = Special / Secret Intelligence TK is a codeword classification, standing for Talent Keyhole, meaning IMINT. TS/SI/TK is often used as a blanket "entry level clearance" for conferences, etc., as it is one of the most carefully controlled and restricted.
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