46 U.S.C. § 58103

1. (a)Except with the written consent of the Secretary of Transportation, a contractor holding a contract under the operating-differential subsidy program or under chapter 575 of this title may not—
   1. (1)employ another person as the managing or operating agent of the operator; or
   2. (2)charter a vessel, on which an operating-differential subsidy is to be paid, for operation by another person.
2. (b)If a charter prohibited by this section is made, the person operating the chartered vessel is subject to all the provisions of this subtitle and the operating-differential subsidy program, including limitations of profits and salaries.