Some are open to non-citizens
The NRC Research Associateship Programs (RAP) promote excellence in scientific and technological research conducted by the U.S. government through the administration of programs offering graduate, postdoctoral, and senior level research opportunities at sponsoring federal laboratories and affiliated institutions.
Education and Experience - Applicants must have earned a Ph.D., Sc.D., M.D., D.V.M., or academically equivalent research doctorate before beginning tenure.
Level - The Fellowships Office makes NRC Research Associateship awards at the postdoctoral and senior researcher level.
• Postdoctoral Associateships - Applicants must have held the doctorate for less than five years at the time of application.
• Senior Associateships - Applicants will have held the doctorate five years or more at the time of application or will hold a permanent appointment in academia, government, or industry and have research experience that has resulted in significant contributions and recognition as established investigators in their specialized fields. Applicants should check the detail of the particular program to which they are applying to determine if senior applicants are accepted.