(1)
Subject to the provisions of this section, the Secretary may repay—
(A)
any loan made, insured, or guaranteed under part B of title IV of the Higher Education Act of 1965 (20 U.S.C. 1071 et seq.);
(B)
any loan made under part D of such title (the William D. Ford Federal Direct Loan Program, 20 U.S.C. 1087a et seq.); or
(C)
any loan made under part E of such title (20 U.S.C. 1087aa et seq.).
Repayment of any such loan shall be made on the basis of each complete year of service performed by the borrower.