National Security Override (NSO)

(U.S.) In some cases of U.S. export law, despite a finding of foreign availability of a controlled commodity, control is maintained over exporting the commodity because it is deemed a national security sensitive item. The term national security override is used to describe this circumstance.
The term has also been used in other contexts. For example, under a November 16, 1990 directive, the president instructed the interagency control groups to move as many dual use items from the U.S. State Department’s International Munitions List to the Commerce Department’s Commerce Control List. In some circumstances, a national security override is applied to prevent transfer of a particular item.
See International Munitions List; Commerce Control List.

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