Section 842.901 - Applicability and purpose(a) This subpart contains regulations of the Office of Personnel Management (OPM) to supplement- (1)5 U.S.C. 8412(d) and (e) , which establish special retirement eligibility for law enforcement officers, members of the Capitol Police and Supreme Court Police, firefighters, nuclear materials couriers, customs and border protection officers, and air traffic controllers employed under the Federal Employees Retirement System (FERS);(2)5 U.S.C. 8422(a) , pertaining to deductions;(3)5 U.S.C. 8423(a) , pertaining to Government contributions; and(4)5 U.S.C. 8425 , pertaining to mandatory retirement.(b) The regulations in this subpart are issued pursuant to the authority given to OPM in 5 U.S.C. 8461(g) to prescribe regulations to carry out the provisions of 5 U.S.C. chapter 84, 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. 76 FR 42000 , July 18, 2011