50 U.S.C. § 3992 — Rights in public lands

(a) Rights not forfeited The rights of a servicemember^* to lands owned or controlled by the United States, and initiated or acquired by the servicemember under the laws of the United States (including the mining and mineral leasing laws) before military service^*, must not be forfeited or prejudiced as a result of being absent from the land, or by failing to begin or complete any work or improvements to the land, during the period of military service^*.
(b) Temporary suspension of permits or licenses If a permittee or licensee under the Act of June 28, 1934 ( 43 U.S.C. 315 et seq.), enters military service, the permittee or licensee may suspend the permit or license for the period of military service and for 180 days after ending of or release from military service.
(c) Regulations Regulations prescribed by the Secretary of the Interior must provide for that suspension of permits and licenses and for the remission, reduction, or refund of grazing fees during the period of that suspension.