45 CFR § 2400.58 - Repayment of stipend.
(a) If a Fellow fails to secure a master's degree, fails to teach American history, American government, social studies, or political science on a full-time basis in a secondary school for at least one school year for each academic year for which assistance was provided under a fellowship, fails to secure at least 12 semester hours or their credit hour equivalent for study of the Constitution as indicated in § 2400.43(b), or fails to attend the Foundation's Summer Institute on the Constitution, the Fellow must repay all of the fellowship costs received plus interest at the rate of 6% per annum or as otherwise authorized and, if applicable, reasonable collection fees, as prescribed in Section 807 of the Act (20 U.S.C. 4506(b)).
(b) If a Fellow withdraws from the fellowship or has a fellowship terminated by the Foundation, the Fellow must repay all fellowship funds which have been remitted to the Fellow or on his or her behalf under a fellowship.