; and (ii) perform functions in support of the Armed Forces of the United States; and (B) if the Secretary makes a written determination that such use is— (i) in the best interests of the Department of Defense; and (ii) otherwise authorized by applicable host nation law or agreement. (2) No funds may be obligated or expended to establish, maintain, or expand a post office established under subsection (a) for the purpose of use described in paragraph (1) of this subsection. . 1083. Guarantee of residency for spouses of members of uniformed services (a) In general Title VI of the Servicemembers Civil Relief Act ( 50 U.S.C. 4021 et seq.) is amended by adding at the end the following new section: 707. Guarantee of residency for spouses of servicemembers For the purposes of establishing the residency of a spouse of a servicemember for any purpose, the spouse of a servicemember may elect to use the same residence as the servicemember regardless of the date on which the marriage of the spouse and the servicemember occurred. . (b) Clerical amendment The table of contents in section 1(b) of such Act is amended by inserting after the item relating to section 706 the following new item: Sec. 707. Guarantee of residency for spouses of servicemembers. . 1084. Extension of requirement for briefings on the national biodefense strategy Section 1086(d) of the National Defense Authorization Act for Fiscal year 2017 ( Public Law 114–328 ; 130 Stat. 2423; 6 U.S.C. 104 ) is amended by striking March 1, 2019 and inserting March 1, 2025 . 1085. Extension of National Commission on Military Aviation Safety (a) Extension of deadline for report Section 1087(h)(2) of the John S. McCain National Defense Authorization Act for Fiscal Year 2019 ( Public Law 115–232