42 C.F.R. § 62.26
(e) Except for Program participants who fail to complete their course of study leading to a health professions degree or who fail to complete approved graduate training and do not receive a waiver pursuant to paragraph (d) of this section, each program participant must:
(2) Accept employment in a full-time clinical practice of the Program participant's profession, as
(f) The minimum length of obligated service is two years, or such longer period as the Program participant may agree to. The maximum length of obligated service is four years. If a Program participant agrees to an original contract of two or three years, such contract may be extended, subject to the availability of appropriated funding, for one year or two years (up to the four-year maximum). A one-year extension will not reactivate the statutory minimum requirement of two years of service.
(Information collection requirements contained in paragraph (b)(2) were approved by the Office of Management and Budget under control number 0915-0131)