46 C.F.R. § 385.37
(b) Justification of restricted eligibility. Where program legislation explicitly restricts eligibility, e.g., to state governments, no justification is required. When program regulations restrict eligibility beyond the restrictions required by the program legislation, the basis for the restriction shall be set forth in the program rulemaking.
41 CFR 9-3.805-51 shall be used as a guide in preparing the “justification for restricting eligibility.” The reasons offered will be evaluated for consistency with the policy in paragraph (a) of this section, MarAd's overall mission, and the objective of maintaining an open and fair system of making assistance awards.