Rest and Recuperation (R&R) Travel:The R&R Travel benefit provides temporary relief for employees and eligible family members from posts with distinct and significant difficulties. R&R eligibility is determined by the Office of Allowances during review of post's Hardship Differential Questionnaire (DS-267). In most cases, a hardship differential equates to a R&R. See 14 FAM 531.5,3 FAM 3720and3 FAH-1 H-3720for additional information on this benefit.
R&R - Diplopedia (Intranet ONLY) The Office of Allowances determines posts' eligibility for R&R, but not individual eligibility or R&R policy more broadly--that portfolio belongs to HR/Employee Relations. For questions about performing R&R travel contact:TransportationQuery@state.gov.
The Standardized Regulations (DSSR) mention R&R in passing but do not contain R&R policy. That is in volume 3 of the FAM.