A Government servant in foreign service may not be granted leave otherwise than in accordance with the rules applicable to the service of which he is a member, and may not take leave or receive leave salary from Government, unless he actually quits duty and goes on leave.
Rules-pedia · F.R. 122 — A Government servant in foreign service may not be granted … – Fundamental Rules (AP) | Rules-pedia
F.R. 122
Chapter XII — Foreign Service