Levels of Classification Used By The U.S. Government
The United States government classifies information according to the degree which the unauthorized disclosure would damage national security. Having Top Secret clearance does not allow one to view all Top Secret documents. The user of the information must possess the clearance necessary for the sensitivity of the information, as well as a need to know the information. For example, all US military pilots are required to obtain at least a Secret clearance, but they may only access documents directly related to their orders. Secret information might have additional access controls that could prevent someone with a Top Secret clearance from seeing it.
Read more about this topic: United States Government Secrecy
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