34 C.F.R. § 304.31
(a) Based upon sufficient evidence to substantiate the grounds, the Secretary may grant an exception to the repayment requirement in § 304.30(j), in whole or part, if the scholar—
(b) Based upon sufficient evidence to substantiate the grounds, the Secretary may grant a deferral of the repayment requirement in § 304.30(j) during the time the scholar—
(4) Is serving as a full-time volunteer under title I of the Domestic Volunteer Service Act of 1973.
(Authority: 20 U.S.C. 1462(h))