DoD issued a final rule to finalize an interim rule that amended the Defense Federal Acquisition Regulation Supplement to implement section 1656 of the National Defense Authorization Act for Fiscal Year 2018. Section 1656 provides that DoD may not procure or obtain or extend or renew a contract to provide or obtain any equipment, system, or service to carry out the DoD nuclear deterrence mission or the DoD homeland defense mission that uses covered telecommunications equipment or services as a substantial or essential component of any system or as a critical technology as a part of any system. Covered telecommunications equipment or services means telecommunications equipment produced by Huawei Technologies Company or ZTE Corporation, or any subsidiary or affiliate of such entities; telecommunication services provided by such entities or using such equipment; or telecommunications equipment or services produced or provided by an entity that the Secretary of Defense reasonably believes to be an entity owned or controlled by, or otherwise connected to, the governments of China or Russia.