; 128 Stat. 3651). (b) Covered parts defined In this section, the term covered parts means commercially available off-the-shelf items as defined in section 104 of title 41, United States Code. B MILITARY CONSTRUCTION AUTHORIZATIONS 2001. Short title This division may be cited as the Military Construction Authorization Act for Fiscal Year 2019 . 2002. Expiration of authorizations and amounts required to be specified by law (a) Expiration of authorizations after five years Except as provided in subsection (b), all authorizations contained in titles XXI through XXVII for military construction projects, land acquisition, family housing projects and facilities, and contributions to the North Atlantic Treaty Organization Security Investment Program (and authorizations of appropriations therefor) shall expire on the later of— (1) October 1, 2023; or (2) the date of the enactment of an Act authorizing funds for military construction for fiscal year 2024. (b) Exception Subsection (a) shall not apply to authorizations for military construction projects, land acquisition, family housing projects and facilities, and contributions to the North Atlantic Treaty Organization Security Investment Program (and authorizations of appropriations therefor), for which appropriated funds have been obligated before the later of— (1) October 1, 2023; or (2) the date of the enactment of an Act authorizing funds for fiscal year 2024 for military construction projects, land acquisition, family housing projects and facilities, or contributions to the North Atlantic Treaty Organization Security Investment Program. 2003. Effective date Titles XXI through XXVII and title XXIX shall take effect on the later of— (1) October 1, 2018