; or (B) any military flight training or transportation over a covered area. (i) Effective date The amendment made by subsection (a) shall take effect on the earlier of— (1) the date that is 180 days after the date of enactment of this Act; and (2) the date on which the Secretary of Defense submits to the appropriate committees of Congress a certification that policies and procedures are in place to ensure the continuation of military overflights over each covered area, as described in subsection (h). 4. Williams Fork Wilderness, White River National Forest, Colorado (a) Designation In furtherance of the purposes of the Wilderness Act ( 16 U.S.C. 1131 et seq.), certain Federal land in the White River National Forest, comprising approximately 8,192 acres and generally depicted as Proposed Williams Fork Wilderness on the map entitled Williams Fork Proposal and dated January 23, 2018, is designated as a potential wilderness area. (b) Management Subject to valid existing rights and except as provided in subsection (d), the potential wilderness area designated by subsection (a) shall be managed in accordance with— (1) the Wilderness Act ( 16 U.S.C. 1131 et seq.); and (2) this section. (c) Livestock use of vacant allotments (1) In general Not later than 3 years after the date of enactment of this Act, in accordance with applicable law (including regulations), the Secretary shall publish a determination regarding whether to authorize livestock grazing or other use by livestock on the vacant allotments known as— (A) the Big Hole Allotment