Definitions from Wikipedia (National Security and Homeland Security Presidential Directive)

▸ noun:  The National Security and Homeland Security Presidential Directive (National Security Presidential Directive NSPD 51/Homeland Security Presidential Directive HSPD-20, sometimes called simply "Executive Directive 51" for short), signed by President of the United States George W. Bush on May 4, 2007, is a Presidential Directive establishing a comprehensive policy on the federal government structures and operations in the event of a "catastrophic emergency".


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