Participants in the Central Intelligence Agency Retirement and Disability System who were participants in such system on or before December 31, 1983, and who have not had a break in service in excess of one year since that date, are not subject to chapter 84 of title 5 without regard to whether they are subject to title II of the Social Security Act [42 U.S.C. 401 et seq.].
The application of the provisions of chapter 84 of title 5 to an employee referred to in subsection (a) shall be subject to the exceptions and special rules provided in this subchapter. Any provision of that chapter which is inconsistent with a special rule provided in this subchapter shall not apply to such employees.