Section 831.1601 - 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 customs and border protection officers employed under the Civil Service Retirement System; 5 U.S.C. 8331(3)(C) and (G) , pertaining to basic pay; 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 subchapter III of chapter 83 of title 5 of the United States Code, and in 5 U.S.C. 1104 to delegate authority for personnel management to the heads of agencies, and pursuant to the authority given the Director of OPM in Section 535(d) of the Department of Homeland Security Appropriations Act, 2008, Division E of Public Law 110-161 , 121 Stat. 1844, at 2075.