1. Short title This Act may be cited as the Southeast Asia Partnership Expansion Act . 2. Extension and modification of pilot program to improve cyber cooperation with foreign military partners in Southeast Asia (a) In general Subsection (a) of section 1256 of the William M. (Mac) Thornberry National Defense Authorization Act for Fiscal Year 2021 ( Public Law 116–283 ; 134 Stat. 3956; 10 U.S.C. 333 note) is amended— (1) in the matter preceding paragraph (1), by striking in Vietnam, Thailand, and Indonesia and inserting with covered foreign military partners ; (2) in paragraph (1)— (A) by inserting defensive before cyber ; and (B) by striking Vietnam, Thailand, and Indonesia and inserting covered foreign military partners ; and (3) in paragraph (2), by striking Vietnam, Thailand, and Indonesia on and inserting covered foreign military partners on defensive . (b) Elements Subsection (b) of such section is amended— (1) in paragraph (1), by striking Vietnam, Thailand, and Indonesia and inserting covered foreign military partners ; and (2) in paragraph (2), by striking Vietnam, Thailand, and Indonesia and inserting covered foreign military partners . (c) Reports Subsection (c)(2)(B) of such section is amended by striking Vietnam, Thailand, and Indonesia and inserting covered foreign military partners . (d) Certification Subsection (d) of such section is amended— (1) by inserting with any covered foreign military partner after scheduled to commence ; and (2) by striking Vietnam, Indonesia, or Thailand and inserting the covered foreign military partner . (e) Extension Subsection (e) of such section is amended by striking December 31, 2024 and inserting December 31, 2029 . (f) Definitions Subsection (f) of such section is amended to read as follows: (f) Definitions In this section: (1) Appropriate committees of Congress The term appropriate committees of Congress means— (A) the Committee on Armed Services and the Committee on Foreign Relations of the Senate