Beginning with fiscal year 1993, not less than 25 percent of the retention bonuses awarded each year under subsection (a) shall be awarded to nurses.
The retention bonus for the entire period covered by the agreement described in subsection (a)(4) shall be paid at the beginning of the agreed upon term of service.
Any physician or nurse failing to complete the agreed upon term of service, except where such failure is through no fault of the individual, shall be obligated to refund to the Government the full amount of the retention bonus for the period covered by the agreement, plus interest as determined by the Secretary in accordance with section 1616a(l)(2)(B) of this title.