projects. Sec. 2102. Family housing. Sec. 2103. Authorization of appropriations, Army. Sec. 2104. Extension of authority to use cash payments in special account from land conveyance, Natick Soldier Systems Center, Massachusetts. Sec. 2105. Extension of authority to carry out fiscal year 2018 project at Kunsan Air Base, Korea. Sec. 2106. Extension of authority to carry out certain fiscal year 2019 projects. Sec. 2107. Extension of authority to carry out certain fiscal year 2021 projects. TITLE XXII—Navy military construction Sec. 2201. Authorized Navy construction and land acquisition projects. Sec. 2202. Family housing. Sec. 2203. Authorization of appropriations, Navy. Sec. 2204. Extension of authority to carry out certain fiscal year 2019 projects. Sec. 2205. Extension of authority to carry out certain fiscal year 2021 projects. TITLE XXIII—Air Force military construction Sec. 2301. Authorized Air Force construction and land acquisition projects. Sec. 2302. Family housing. Sec. 2303. Authorization of appropriations, Air Force. Sec. 2304. Extension of authority to carry out certain fiscal year 2017 projects. Sec. 2305. Extension of authority to carry out certain fiscal year 2018 projects. Sec. 2306. Extension of authority to carry out certain fiscal year 2019 projects. Sec. 2307. Extension of authority to carry out certain fiscal year 2021 projects. TITLE XXIV—Defense Agencies military construction Sec. 2401. Authorized Defense Agencies construction and land acquisition projects. Sec. 2402. Authorized Energy Resilience and Conservation Investment Program projects. Sec. 2403. Authorization of appropriations, Defense Agencies. Sec. 2404. Extension of authority to carry out certain fiscal year 2018 projects. Sec. 2405. Extension and modification of authority to carry out certain fiscal year 2019 projects. Sec. 2406. Extension of authority to carry out certain fiscal year 2021 projects. Sec. 2407. Additional authority to carry out certain fiscal year 2022 projects. Sec. 2408. Additional authority to carry out