; (ii) is impracticable to accomplish by nonmotorized methods; and (iii) is in accordance with memoranda of understanding between the applicable Federal agencies and the 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— (i) is impracticable to accomplish without use of aircraft; and (ii) is in accordance with memoranda of understanding between the applicable Federal agencies and the State Department of Fish and Wildlife. (e) Buffer zones (1) In general Nothing in this title 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 title 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; or (3) the use or establishment of a military flight training route over a wilderness area or addition. (g) Horses Nothing in this title precludes horseback riding in, or the entry of recreational or commercial saddle or pack stock into, a wilderness area or addition— (1) in accordance with section 4(d)(5) of the Wilderness Act ( 16 U.S.C. 1133(d)(5) )