US lawFederal (United States)RegulationsTitle 5 CFR — Administrative PersonnelChapter I — OFFICE OF PERSONNEL MANAGEMENTPart 550 — PAY ADMINISTRATION (GENERAL)Subpart I — Pay for Duty Involving Physical Hardship or Hazard550.9015 C.F.R. § 550.901Purpose.Last amended: 2016Year: 2026Length: 38 wordsOfficial source Cite as 5 C.F.R. § 550.901 (2026)This subpart prescribes the regulations required by sections 5545(d) and 5548(b) of title 5, United States Code, for the payment of differentials for duty involving unusual physical hardship or hazard to employees. [56 FR 20344, May 3, 1991]Next5 C.F.R. § 550.902