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  2. List of U.S. security clearance terms - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._security...

    This list covers security clearance terms used in the United States of America.. Within the U.S. government, security clearance levels serve as a mechanism to ascertain which individuals are authorized to access sensitive or classified information.

  3. Classified information in the United States - Wikipedia

    en.wikipedia.org/wiki/Classified_information_in...

    The United States has three levels of classification: Confidential, Secret, and Top Secret. Each level of classification indicates an increasing degree of sensitivity. Thus, if one holds a Top Secret security clearance, one is allowed to handle information up to the level of Top Secret, including Secret and Confidential information. If one ...

  4. Security clearance - Wikipedia

    en.wikipedia.org/wiki/Security_clearance

    United States. In the United States, a security clearance is an official determination that an individual may access information classified by the United States Government. Security clearances are hierarchical; each level grants the holder access to information in that level and the levels below it.

  5. Classified information - Wikipedia

    en.wikipedia.org/wiki/Classified_information

    The Washington Post reported in an investigation entitled "Top Secret America" that, as of 2010, "An estimated 854,000 people ... hold top-secret security clearances" in the United States. [ 7 ] Secret

  6. Sensitive compartmented information - Wikipedia

    en.wikipedia.org/wiki/Sensitive_compartmented...

    Sensitive compartmented information (SCI) is a type of United States classified information concerning or derived from sensitive intelligence sources, methods, or analytical processes. All SCI must be handled within formal access control systems established by the Director of National Intelligence. [1]

  7. Q clearance - Wikipedia

    en.wikipedia.org/wiki/Q_clearance

    Q clearance or Q access authorization is the U.S. Department of Energy (DOE) security clearance required to access Top Secret Restricted Data, Formerly Restricted Data, and National Security Information, as well as Secret Restricted Data. Restricted Data (RD) is defined in the Atomic Energy Act of 1954 and covers nuclear weapons and related ...

  8. Special access program - Wikipedia

    en.wikipedia.org/wiki/Special_access_program

    Special access programs (SAPs) in the U.S. Federal Government are security protocols that provide highly classified information with safeguards and access restrictions that exceed those for regular (collateral) classified information. SAPs can range from black projects to routine but especially-sensitive operations, such as COMSEC maintenance ...

  9. Sensitive but unclassified - Wikipedia

    en.wikipedia.org/wiki/Sensitive_but_unclassified

    Sensitive Security Information (SSI) is a category of sensitive but unclassified information under the United States government's information sharing and control rules, often used by TSA and CBP. SSI is information obtained in the conduct of security activities whose public disclosure would, in the judgment of specified government agencies ...