; or (2) enter into a contract (or extend or renew a contract) with an entity that uses any equipment, system, or service that uses covered telecommunications equipment or services as a substantial or essential component of any system, or as critical technology as part of any system. (c) Effective dates The prohibition under subsection (b)(1) shall take effect 180 days after the date of the enactment of this Act and the prohibition under subsection (b)(2) shall take effect three years after the date of the enactment of this Act. (d) Rule of construction Nothing in this section shall be construed to— (1) prohibit the Secretary of Defense from procuring with an entity to provide a service that connects to the facilities of a third-party, such as backhaul, roaming, or interconnection arrangements