receiving a preference under subsection (e) applied with respect to a contractor shall apply to any subsidiary or parent company of the contractor. . (2) Technical and conforming amendment The table of sections at the beginning of chapter 47 of title 41, United States Code, is amended by adding at the end the following new item: 4713. Preference for keeping jobs in the United States. . (b) Defense contracts (1) Amendment Chapter 137 of title 10, United States Code, is amended by inserting after section 2316 the following new section: 2317. Preference for keeping jobs in the United States (a) Preference The head of an agency shall give a preference for an offeror that certifies to retain jobs performed in the United States (regardless of the citizenship of the employee) in the United States and uses products substantially manufactured in the United States and services provided in the United States for the contract for which an offer is made. (b) Applicability to subcontracts The preference described under subsection (a) applies to the award of a contract by any agency named in section 2303 of this chapter and the award of any subcontract (at any tier) in the performance of such contract. (c) Certification To be eligible for the preference described under subsection (a), an offeror shall submit a certification that confirms the offeror and any subcontractor (if applicable)— (1) has not relocated jobs from the United States to foreign countries in the preceding five years