Section 831.801 - Applicability and purpose(a) This subpart contains regulations of the Office of Personnel Management (OPM) to supplement 5 U.S.C. 8336(c) , which establishes special retirement eligibility for nuclear materials couriers employed under the Civil Service Retirement System; 5 U.S.C. 8334(a)(1) and (c) , pertaining to deductions, contributions, and deposits; 5 U.S.C. 8335(b) , pertaining to mandatory retirement; and 5 U.S.C. 8339(d) , pertaining to computation of annuity.(b) The regulations in this subpart are issued pursuant to the authority given to OPM in 5 U.S.C. 8347 to prescribe regulations to carry out 5 U.S.C., chapter 83, subchapter III, and in 5 U.S.C. 1104 to delegate authority for personnel management to the heads of agencies.