14 C.F.R. § 1212.604 Social security numbers.
Title 14 - Aeronautics and Space
(a) It is unlawful for NASA to deny to individuals any rights, benefits, or privileges provided by law because of the individuals' refusal to disclose their social security numbers, except where: (1) The disclosure is required by law; or (2) The disclosure is from a system of records in existence and operating before January 1, 1975, and was required under statute or regulation adopted before that date to verify the identity of the individual(s). (b) Any time individuals are requested to disclose their social security numbers, NASA shall indicate whether that disclosure is mandatory or voluntary, by what authority the numbers are requested, and what uses will be made of them.
Title 14: Aeronautics and Space
PART 1212—PRIVACY ACT—NASA REGULATIONS
Subpart 1212.6—Instructions for NASA Employees
§ 1212.604 Social security numbers.

