Officials of the Forest Service designated by the Secretary of Agriculture shall, in all ways that are practicable, aid in the enforcement of the laws of the States or Territories with regard to stock, for the prevention and extinguishment of forest fires, and for the protection of fish and game, and with respect to national forests, shall aid the other Federal bureaus and departments on request from them, in the performance of the duties imposed on them by law.
16 U.S. Code § 553 - Duties of officials of Forest Service; stock laws; protection of fish and game
Functions of Secretary of Agriculture, administered through Bureau of Biological Survey, relating to conservation of wildlife, game, and migratory birds, transferred to Secretary of the Interior by Reorg. Plan No. II of 1939, § 4(f), eff. July 1, 1939, 4 F.R. 2731, 53 Stat. 1433, set out in the Appendix to Title 5, Government Organization and Employees.