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A United States 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.
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).
The Secret Service is tasked with ensuring the safety of the president of the United States, the vice president of the United States, the president-elect of the United States, the vice president-elect of the United States, and their immediate families; former presidents, their spouses and their children under the age of 16; those in the presidential line of succession, major presidential and ...
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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.
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.
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A USSS Uniformed Division police officer and a USSS Ford Crown Victoria Police Interceptor near the White House in 2012 A 2013 Ford Police Interceptor of the U.S. Secret Service Uniformed Division is pictured outside the White House in Washington, D.C., in July 2013 Secret Service Ford Taurus Secret Service Ford Police Interceptor Utility A U.S. Secret Service "counter-sniper" marksman on top ...