; and (2) if the date of the enactment of this Act occurs after August 31 of a year, shall apply with respect to plans for alternative pay adjustments for any year beginning after the year following such year. 606. Eligibility of reserve component members for high-deployment allowance for lengthy or numerous deployments and frequent mobilizations Section 436(a)(2)(C)(ii) of title 37, United States Code, is amended by inserting after under the first place it appears the following: section 12304b of title 10 or . 607. Eligibility of reserve component members for nonreduction in pay while serving in the uniformed services or National Guard Section 5538(a) of title 5, United States Code, is amended in the matter preceding paragraph (1) by inserting after under the following: section 12304b of title 10 or . 608. Temporary adjustment in rate of basic allowance for housing following identification of significant underdetermination of civilian housing costs for housing areas Section 403(b) of title 37, United States Code, is amended by adding at the end the following new paragraph: (8) (A) Under the authority of this paragraph, the Secretary of Defense may prescribe a temporary adjustment in the current rates of basic allowance for housing for a military housing area or portion of a military housing area if the Secretary determines that the actual costs of adequate housing for civilians in that military housing area or portion thereof differ from such current rates of basic allowance for housing by an amount in excess of 20 percent of such current rates of basic allowance for housing. (B) Any temporary increase in rates of basic allowance for housing under this paragraph shall remain in effect only until the next annual adjustment in rates of basic allowance for housing under this subsection by law. (C) This paragraph shall cease to be effective on December 31, 2019. . B Bonuses and Special and Incentive Pays 611. One-year extension of certain expiring bonus and special pay authorities (a) Authorities relating to title