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National Security Agency
The National Security Agency, under the auspices of the Department of Defense, is the highly secretive collector of signals intelligence and code-cracking arm of the US government. The NSA was created in 1952 via a presidential directive. The agency director is always a military officer (awarded three or more stars), while the deputy director is always a “technically experienced civilian.”


http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB23/02-09.htm