; (B) to return any such funds in excess of the cost of attendance at such higher education institution; (C) to maintain satisfactory academic standing, as determined by the Secretary; (D) to return such funds for an academic year if— (i) in such year, the fellow earns less than 60 percent of the credits required at the institution of higher education at which the fellow is enrolled; and (ii) the fellow is no longer enrolled at such institution or another institution of higher education at the start of the next academic year; (E) to complete an internship under this section in a manner that is satisfactory, as determined by the Secretary; (F) upon completion of the degree that the student pursues while in the fellowship program, to work for the Federal Government or in the field of education in the area of study for which the scholarship or fellowship was awarded, for a period specified by the Secretary, which shall not be longer than the period for which scholarship assistance was provided to such student; and (G) to return the amount of the assistance provided the recipient under the program with interest at a rate determined by the Secretary if the student fails to comply with subsections (A) through (F). (6) Enforcement of agreement The Secretary may enforce the agreement under paragraph (5) as the Secretary determines appropriate. (e) Internship (1) In general The Secretary shall establish an internship program that provides each student an internship at a Defense Agency. (2) Requirements Each internship shall— (A) to the extent practicable, last a period of at least 10 weeks; (B) to the extent practicable, be at a Defense Agency; (C) include a stipend for transportation and living expenses incurred by the fellow during the fellowship