; and (2) subject to any terms and conditions determined to be necessary by the Secretary. (d) Grazing The grazing of livestock in a wilderness addition, if established before the date of enactment of this Act, shall be permitted to continue, subject to such reasonable regulations as are determined to be necessary by the Secretary, in accordance with section 4(d)(4) of the Wilderness Act ( 16 U.S.C. 1133(d)(4) ). (e) Military overflights Nothing in this Act restricts or precludes— (1) low-level overflights of military aircraft over the wilderness additions, including military overflights that can be seen or heard within the wilderness additions; (2) flight testing and evaluation; or (3) the designation or creation of new units of special use airspace, or the establishment of military flight training routes, over the wilderness additions. (f) Commercial services Commercial services (including authorized outfitting and guide activities) within the wilderness additions may be authorized to the extent necessary for activities that are appropriate for the recreational or other wilderness purposes of the wilderness additions, in accordance with section 4(d)(5) of the Wilderness Act ( 16 U.S.C. 1133(d)(5) ).