Authorization of appropriations, defense agencies. Sec. 2404. Extension of authorizations of certain fiscal year 2015 projects. Sec. 2405. Authorization of certain fiscal year 2018 project. TITLE XXV—International programs Subtitle A—North Atlantic Treaty Organization Security Investment Program Sec. 2501. Authorized NATO construction and land acquisition projects. Sec. 2502. Authorization of appropriations, NATO. Subtitle B—Host country in-kind contributions Sec. 2511. Republic of Korea funded construction projects. TITLE XXVI—Guard and Reserve Forces facilities Subtitle A—Project authorizations and authorization of appropriations Sec. 2601. Authorized Army National Guard construction and land acquisition projects. Sec. 2602. Authorized Army Reserve construction and land acquisition projects. Sec. 2603. Authorized Navy Reserve and Marine Corps Reserve construction and land acquisition projects. Sec. 2604. Authorized Air National Guard construction and land acquisition projects. Sec. 2605. Authorized Air Force Reserve construction and land acquisition projects. Sec. 2606. Authorization of appropriations, National Guard and Reserve. Subtitle B—Other matters Sec. 2611. Modification of authority to carry out certain fiscal year 2016 project. Sec. 2612. Modification of authority to carry out certain fiscal year 2018 project. Sec. 2613. Additional authority to carry out certain fiscal year 2019 project. TITLE XXVII—Base realignment and closure activities Sec. 2701. Authorization of appropriations for base realignment and closure activities funded through Department of Defense Base Closure Account. Sec. 2702. Prohibition on conducting additional base realignment and closure (BRAC) round. TITLE XXVIII—Military Construction and general provisions Subtitle A—Military Construction Program and military family housing changes Sec. 2801. Additional authority to obtain architectural and engineering services and construction design for defense laboratory modernization pilot program. Sec. 2802. Modification of contract