As a condition of receiving an annual payment of more than $25,000 under
section 51505 of this title, a State maritime academy also must agree to admit each year a number of citizens of the United States who meet its admission requirements and reside in a State not supporting that academy. The Secretary shall determine the number of individuals to be admitted by each academy under this subsection. The number may not be more than one-third of the total number of individuals attending the academy at any time.