; or (C) contrary to the best interests of the United States. (2) Regulations The Administrator may establish, by regulations, procedures for determining the amount of the repayment required under this subsection and the circumstances under which an exception to repayment may be granted. The Administrator may specify in the regulations the conditions under which financial assistance to be paid to a member of the program will not be made if the member no longer satisfies the requirements in subsection (c) or qualifications in subsection (d) for such assistance. (3) Obligation as debt to United States An obligation to repay the United States under this subsection is, for all purposes, a debt owed to the United States. . (b) Clerical amendment The table of contents in section 1 of the Act entitled An Act to authorize the Hydrographic Services Improvement Act of 1998, and for other purposes ( Public Law 107–372 ), as amended by section 104(b), is further amended by inserting after the item relating to section 217 the following: Sec. 218. Aviation accession training programs. . 106. Recruiting materials (a) In general Subtitle A ( 33 U.S.C. 3001 et seq.), as amended by section 105(a), is further amended by adding at the end the following: 219. Use of recruiting materials for public relations The Secretary may use for public relations purposes of the Department of Commerce any advertising materials developed for use for recruitment and retention of personnel for the commissioned officer corps of the Administration. Any such use shall be under such conditions and subject to such restrictions as the Secretary shall prescribe. . (b) Clerical amendment The table of contents in section 1 of the Act entitled An Act to authorize the Hydrographic Services Improvement Act of 1998, and for other purposes ( Public Law 107–372 ), as amended by section 105(b), is further amended by inserting after the item relating to section 217 the following: Sec. 219. Use of recruiting materials for public relations. . 107. Procurement of