PUBLIC LAW 106-398—APPENDIX 114 STAT. 1654A-263 (b) ELEMENTS OF PLAN. —The plan specified under subsection (a) shall include the Secretary's plans, if any, for the sustainment and modernization of the following: (1) Land-based and sea-based strategic ballistic missiles, including any plans for developing replacements for the Minuteman III intercontinental ballistic missile and the Trident II sea-launched ballistic missile and plans for common ballistic missile technology development. (2) Strategic nuclear bombers, including any plans for a B-2 follow-on, a B-52 replacement, and any new air-launched weapon systems. (3) Appropriate warheads to outfit the strategic nuclear delivery systems referred to in paragraphs (1) and (2) to satisfy evolving military requirements. (c) SUBMITTAL OF PLAN.— The plan specified under subsection (a) shall be submitted to Congress not later than April 15, 2001. The plan shall be submitted in unclassified and classified forms, as necessary. SEC. 1043. MODIFICATION OF SCOPE OF WAIVER AUTHORITY FOR LIMITATION ON RETIREMENT OR DISMANTLEMENT OF STRATEGIC NUCLEAR DELIVERY SYSTEMS. Section 1302(b) of the National Defense Authorization Act for Fiscal Year 1998 (Public Law 105-85; 111 Stat. 1948), as amended by section 1501(a) of the National Defense Authorization Act for Fiscal Year 2000 (Public Law 106-65; 113 Stat. 806), is further amended by striking "the application of the limitation in effect under paragraph (1)(B) or (3) of subsection (a), as the case may be," and inserting "the application of the limitation in effect under subsection (a) to a strategic nuclear delivery system". SEC. 1044. REPORT ON THE DEFEAT OF HARDENED AND DEEPLY BURIED TARGETS. (a) STUDY.— The Secretary of Defense shall, in conjunction with the Secretary of Energy, conduct a study relating to the defeat of hardened and deeply buried targets. Under the study, the Secretaries shall— (1) review— (A) the requirements of the United States to defeat hardened and deeply buried targets and stockpiles of chemical and biological agents and related capabilities; and (B) current and future plans to meet those requirements; (2) determine if those plans adequately address all such requirements; (3) identify potential future hardened and deeply buried targets and other related targets; (4) determine what resources and research and development efforts are needed to defeat the targets identified under paragraph (3) as well as other requirements to defeat stockpiles of chemical and biological agents and related capabilities; (5) assess both current and future options to defeat hardened and deeply buried targets as well as concepts to defeat stockpiles of chemical and biological agents and related capabilities; and (6) determine the capability and cost of each option assessed under paragraph (5).