; and (B) collect the repayment amounts within a period of time as determined by the Secretary of Defense, or the repayment amounts shall be treated as a loan in accordance with subsection (j). (2) Returned to Treasury Except as provided in paragraph (3), any repayment under this subsection shall be returned to the Treasury of the United States. (3) Retain percentage A covered institution may retain a percentage of any repayment the institution collects under this subsection to defray administrative costs associated with the collection. The Secretary of Defense shall establish a single, fixed percentage that will apply to all eligible entities. (l) Exceptions The Secretary of Defense may provide for the partial or total waiver or suspension of any service or payment obligation by an individual under this section whenever compliance by the individual with the obligation is impossible or would involve extreme hardship to the individual, or if enforcement of such obligation with respect to the individual would be unconscionable. (m) Evaluation and report The Secretary of Defense shall evaluate and report periodically to Congress on the success of recruiting individuals for scholarships under this section and on hiring and retaining those individuals in the public sector workforce. (n) Covered institution defined In this section, the term covered institution has the meaning given that term in section 262(g)(2) of the National Defense Authorization Act for Fiscal Year 2020 ( Public Law 116–92 ).