communications security devices, military grade GPS, and anti-spoofing devices, as Government-furnished equipment. (C) Department of Defense policy (i) In general The Secretary of Defense shall implement policies, and ensure that the head of each military department implements policies, that allow United States companies to enter into agreements with manufacturers of Government-furnished equipment so that production on long-lead Government-furnished equipment may begin before the execution of a signed commercial contract or the issuance of a letter of offer and acceptance. (ii) Elements The policies required by clause (i) shall require that— (I) United States companies shall— (aa) before entering into an agreement under this paragraph, obtain the concurrence or approval of the head of the military department concerned to do so