5 U.S. Code § 6310
5 U.S. Code § 6310 is about Leave of absence; aliens. It is under Subchapter I (Annual And Sick Leave) of Chapter 63 (Leave) of Subpart E (Attendance and Leave) of Part III (Employees) of Title 5 (Government Organizations and Employees) of the Code.
The head of the agency concerned may grant leave of absence with pay, not in excess of the amount of annual and sick leave allowable to citizen employees under this subchapter, to alien employees who occupy positions outside the United States.