NSA meaning in General ?

The National Security Archive is a 501(c)(3) non-governmental, non-profit research and archival institution located on the campus of the George Washington University in Washington, D.C. Founded in 1985 to check rising government secrecy, the National Security Archive is an investigative journalism center, open government advocate, international affairs research institute, and the largest repository of declassified U.S. documents outside the federal government. The National Security Archive has spurred the declassification of more than 10 million pages of government documents by being the leading non-profit user of the U.S. Freedom of Information Act (FOIA), filing a total of more than 50,000 FOIA and declassification requests in its over 30 years of history.