PUBLIC LAW 106-65—OCT. 5, 1999 113 STAT. 911 (B) Any Executive order or public land order in effect on the date of the enactment of this Act with respect to the Cabeza Prieta National Wildlife Refuge. (c) EXTENSION OF MEMORANDUM OF UNDERSTANDING.—The Secretary of the Interior, the Secretary of the Navy, and the Secretary of the Air Force shall extend the memorandum of understanding referred to in subsection (b)(1)(B). The memorandum of understanding shall be extended for a period that coincides with the duration of the withdrawal and reservation of the Barry M. Goldwater Air Force Range made by section 3031. (d) OTHER AMENDMENTS OF MEMORANDUM OF UNDER- STANDING. — (1) AMENDMENTS TO MEET MILITARY AVIATION TRAINING NEEDS.— (A) When determined by the Secretary of the Navy or the Secretary of the Air Force to be essential to support military aviation training, the Secretary of the Navy, the Secretary of the Air Force, and the Secretary of the Interior shall negotiate amendments to the memorandum of understanding referred to in subsection (b)(1)(B) in order— (i) to revise existing or establish new low-level training routes or to otherwise accommodate low-level overflight; (ii) to establish new or enlarged areas closed to public use as surface safety zones; or (iii) to accommodate the maintenemce, upgrade, replacement, or installation of existing or new associated ground instrumentation. (B) Any amendment of the memorandum of understanding shall be consistent with the responsibilities under law of the Secretary of the Navy, the Secretary of the Air Force, and the Secretary of the Interior, respectively. (C) As provided by the existing provisions of the National Wildlife Refuge System Improvement Act of 1997 (Public Law 105-57) and the Arizona Desert Wilderness Act of 1990 (Public Law 101-628), amendments to the memorandum of understanding to revise existing or establish new low-level training routes or to otherwise accommodate low-level overflight are not subject to compatibility determinations nor precluded by the designation of lands within the Cabeza Prieta National Wildlife Refuge as wilderness. (D) Amendments to the memorandum of understanding with respect to the upgrade or replacement of existing associated ground instrumentation or the installation of new associated ground instrumentation shall not be precluded by the existing designation of lands within the Cabeza Prieta National Wildlife Refuge as wilderness to the extent that the Secretary of the Interior, after consultation with the Secretary of the Navy and the Secretary of the Air Force, determines that such actions, considered both individually and cumulatively, create similar or less impact than the existing ground instrumentation permitted by the Arizona Desert Wilderness Act of 1990. (2) OTHER AMENDMENTS.—The Secretary of the Interior, the Secretary of the Navy, or the Secretary of the Air Force may initiate renegotiation of the memorandum of understanding at any time to address other needed changes, and the memorandum of understanding may be amended to
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