; and (ii) the public housing agency may establish a system for making dwelling units that are not occupied pursuant to the preference under clause (i) available . (b) Voucher assistance Subparagraph (A) of section 8(o)(6) of the United States Housing Act of 1937 ( 42 U.S.C. 1437f(o)(6)(A) ) is amended— (1) by redesignating clauses (i) and (ii) as clauses (ii) and (iii), respectively; (2) by inserting before clause (ii), as so redesignated by paragraph (1) of this subsection, the following new clause: (i) Children aging-out of foster care In making tenant-based assistance under this subsection available on behalf of eligible families, each public housing agency shall give preference to otherwise eligible children who are in foster care, have attained an age such that the provision of foster care for such child will end by reason of the age of the child within 6 months, meet the requirements under clauses (i) and (ii) of paragraph (1) of the definition of at risk of homelessness in section 91.5 of the Secretary’s regulations (24 C.F.R. 91.5), as in effect on September 1, 2016, and have agreed to comply with the requirements under section 38(c). ; (3) in clause (ii), as so redesignated by paragraph (1) of this subsection, by inserting that is not made available in accordance with the preference under clause (i) after under this subsection