; or (B) $40,000. (2) Proof of use of amounts Participants under this section in receipt of a lump sum education debt reduction payment under this section must provide proof of payment verifying the full lump sum payment received was paid to the lender for the loan held by such participant not later than 45 days after receiving the lump sum payment. (d) Period of obligated service (1) In general In exchange for a one-time lump sum education debt payment under this section, a participant under this section shall agree to be employed for not less than three years at the Department (in this section referred to as the period of obligated service ). (2) Positions of employment (A) Medical support Not fewer than two of the years of the period of obligated service of a participant under this section shall be served in the position of medical support assistant, advanced medical support assistant, lead medical support assistant, or supervisory medical support assistant of the Department. (B) Hard-to-hire or hard-to-recruit The remainder of any period of obligated service not covered under subparagraph (A) shall be served in a hard-to-hire or hard-to-recruit position as determined by the Secretary. (e) Liability during period of obligated service (1) In general Except as provided in paragraph (2), if a participant under this section fails to complete the period of obligated service of the participant for any reason, the United States shall be entitled to recover from the participant an amount equal to— (A) the total amount paid under this section to the participant; multiplied by (B) a fraction— (i) the numerator of which is— (I) the total number of months in the period of obligated service of the participant; minus (II) the number of months served by the participant