; executive director The terms Board and Executive Director have the meanings given those terms in section 8401 of title 5, United States Code. (2) Covered sum The term covered sum means any sum of the Thrift Savings Fund that is invested in a mutual fund, exchange-traded fund, or other investment vehicle described in subparagraph (E) or (F) of section 8438(b)(5) of title 5, United States Code, as added by subsection (b). (3) Mutual fund window The term mutual fund window means the mutual fund window added by the Board pursuant to the authorization under section 8438(b)(5) of title 5, United States Code. (4) Participant The term participant has the meaning given the term in section 8471 of title 5, United States Code. (5) Thrift savings fund The term Thrift Savings Fund means the fund established under section 8437 of title 5, United States Code. (b) Prohibition (1) In general Section 8438(b)(5) of title 5, United States Code, is amended by adding at the end the following: (E) The Board may not offer through the mutual fund window any mutual fund, exchange-traded fund (as defined in section 270.6c–11 of title 17, Code of Federal Regulations, or any successor regulation), or other investment vehicle that invests in bonds or equities and that makes investment decisions based on ESG criteria, to the extent that those criteria are unrelated to maximizing monetary returns for investors. (F) The Board may not offer through the mutual fund window any mutual fund, exchange-traded fund (as defined in section 270.6c–11 of title 17, Code of Federal Regulations, or any successor regulation), or other investment vehicle that is marketed as making investment decisions based on ESG criteria. (G) In this paragraph, the term ESG criteria means any of the following criteria: (i) Environmental criteria, including— (I) emissions, climate change, sustainability, environmental justice, pollution, or conservation