Except as otherwise required as a result of NRS 286.537:
may, except as otherwise provided in subsection 5, cause to be purchased on the member's behalf service credit, not to exceed the number of hours of unused sick leave or 1 year, whichever is less. The full actuarial cost of the service as determined by an actuary of the System must be paid for such a purchase. Any service credit purchased pursuant to this subsection must be included as a part of, and is not in addition to, service purchased pursuant to subsection 2.
to purchase creditable service pursuant to subsection 1, 2 or 3.
NRS 286.300