Wikipedia

Federal Bureau of Investigation The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States, and its principal federal law enforcement
Diplomatic Security Service The United States Diplomatic Security Service (DSS or DS) is the federal law enforcement and security arm of the United States Department of State. Its
List of U.S. security clearance terms terminology and lettering, as is discussed below. Security clearance levels often appear in employment postings for Defense related jobs, and other jobs
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