National Security Agency Act of 1959, Pub. L. No. 86-36, 73 Stat. 63 (May 29, 1959), codified at 50 U.S.C. §402, as amended (full-text).
The Act does not describe the functions of the National Security Agency (NSA), but deals with "housekeeping" matters such as pay and allowances, training, property acquisition, and leasing, It exempted NSA from the requirement to provide detailed information regarding organizational and functional matters to the Civil Service Commission (the predecessor of the Office of Personnel Management).
The act has been amended from time to time and serves as the statutory basis for NSA's personnel policies that derive from its unique mission, including special pay and allowances for overseas travel, professional and foreign language training, and property leasing, and use of the NSA.