; and (iv) may provide highest preference for occupancy to, in addition to eligible children described in clause (iii), not more than two other types of families. . (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) in clause (i), by striking may the first place such term appears and inserting shall ; (2) by redesignating clause (ii) as clause (iii); (3) by inserting before clause (iii), as so redesignated by paragraph (1) of this subsection, the following new clause: (ii) Highest preference Each system of preferences established pursuant to this subparagraph— (I) shall provide that the highest preference for assistance shall be given 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 39(c); and (II) may provide highest preference for assistance to, in addition to eligible children described in subclause (I), not more than two other types of eligible families. ; and (4) in clause (iii), as so redesignated by paragraph (2) of this subsection, by striking Each system and inserting Except as provided in clause (ii)(I), each system . (c) PHA project-Based voucher assistance Subparagraph (J) of section 8(o)(13) of the United States Housing Act of 1937 ( 42 U.S.C. 1437f(o)(13)(J) ) is amended— (1) by striking (J) Tenant selection .—A public and inserting the following: (J) Tenant selection (i) Selection and eligibility A public