PROHIBITION ON TRIDENT IIBACKFIT.

SEC. 124. PROHIBITION ON TRIDENT IIBACKFIT. (a) Limitation.— The Secretary of the Navy may not modify any Trident I submarine to enable that submarine to be deployed with Trident II (D–5) missiles. (b) Waiver Authority.— If the Secretary of Defense determines that adherence to the prohibition in subsection (a) would result in a significant national security risk to the United States, the Secretary may waive that prohibition. Such a waiver may not take effect until the Secretary submits to Congress a certification of that determination and of the reasons for that determination.