5 U.S.C. § 8151 - U.S. Code - Unannotated Title 5. Government Organization and Employees § 8151. Civil service retention rights

(1) the department or agency which was the last employer shall immediately and unconditionally accord the employee, if the injury or disability has been overcome within one year after the date of commencement of compensation or from the time compensable disability recurs if the recurrence begins after the injured employee resumes regular full-time employment with the United States, the right to resume his former or an equivalent position, as well as all other attendant rights which the employee would have had, or acquired, in his former position had he not been injured or disabled, including the rights to tenure, promotion, and safeguards in reductions-in-force procedures, and

(2) the department or agency which was the last employer shall, if the injury or disability is overcome within a period of more than one year after the date of commencement of compensation, make all reasonable efforts to place, and accord priority to placing, the employee in his former or equivalent position within such department or agency, or within any other department or agency.