; and (ii) appropriate policies, such as the policies established in Appendix B of the report of the Committee on Interior and Insular Affairs of the House of Representatives accompanying H.R. 2570 of the 101st Congress (H. Rept. 101–405). (B) Inclusions A management activity under subparagraph (A) may include the occasional and temporary use of motorized vehicles, if the use, as determined by the Secretary, would maintain or improve wilderness character, is impossible to accomplish by nonmotorized methods, and is in accordance with memoranda of understanding between the Federal agencies and the California State Department of Fish and Wildlife. (C) Existing activities In accordance with section 4(d)(1) of the Wilderness Act ( 16 U.S.C. 1133(d)(1) ) and other appropriate policies (such as the policies established in Appendix B of the report of the Committee on Interior and Insular Affairs of the House of Representatives accompanying H.R. 2570 of the 101st Congress (H. Rept. 101–405)), the State may use aircraft (including helicopters) in a wilderness area or addition to survey, capture, transplant, monitor, or provide water for a wildlife population, including bighorn sheep, if the activity, as determined by the Secretary is impossible to accomplish without use of aircraft, and is in accordance with memoranda of understanding between the Federal agencies and the California State Department of Fish and Wildlife. (e) Buffer zones (1) In general Nothing in this Act establishes any protective perimeter or buffer zone around a wilderness area or addition. (2) Activities or uses up to boundaries The fact that a nonwilderness activity or use can be seen or heard from within a wilderness area or addition shall not preclude the activity or use up to the boundary of the wilderness area or addition. (f) Military activities Nothing in this Act precludes— (1) low-level overflights of military aircraft over a wilderness area or addition; (2) the designation of a new unit of special airspace over a wilderness area or addition