# Defense Federal Acquisition Regulation Supplement: Preference for United States Vessels in Transporting Supplies By Sea (DFARS Case 2021-D020)
> **Defense Federal Acquisition Regulations System** · Final rule. · Published 2024-09-26 · Effective 2024-10-01 · 89 FR 78992
## Document
- **Document number:** 2024-21092
- **Category:** dfars-acquisition
- **Sub-agency:** Defense Federal Acquisition Regulations System
- **Federal Register citation:** 89 FR 78992
- **CFR reference:** 48 CFR 242
- **Publication date:** 2024-09-26
- **Effective date:** 2024-10-01
- **DOD docket:** Docket DARS-2024-0013
## Abstract

DoD is issuing a final rule amending the Defense Federal Acquisition Regulation Supplement (DFARS) to implement a section of the William M. (Mac) Thornberry National Defense Authorization Act for Fiscal Year 2021 intended to increase compliance with military cargo preference requirements.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2024/09/26/2024-21092/defense-federal-acquisition-regulation-supplement-preference-for-united-states-vessels-in)
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