Vanguard U.S. Government Bond Index Fund USD Acc (ISIN: IE0007471927; Ticker: 0P00000RNB) is a passive fixed income open-ended investment company domiciled in Ireland and launched on January 31, 2002, that tracks the performance of the Bloomberg U.S. Government Float Adjusted Bond Index. The fund invests in a representative sample of U.S. dollar-denominated bonds issued or guaranteed by the U.S. government, including U.S. Treasury notes and bonds with maturities greater than one year; its portfolio is characterized by high credit quality and moderate interest-rate sensitivity, with top holdings such as United States Treasury Notes 4.625%, 4.25%, 4.375%, and 3.875%; as an accumulation share class, it reinvests income and maintains an ongoing charge of 0.12%. Vanguard Group (Ireland) Limited serves as the investment manager, with the fund available for sale across Europe including Austria, Denmark, Finland, France, Germany, Iceland, Ireland, Italy, Liechtenstein, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom; it targets institutional investors with a minimum initial investment of approximately GBP 761,120 (or equivalent). The fund operates within the USD Government Bond sector, focusing exclusively on non-UK bonds (100% allocation), and maintains a total size of around GBP 5.38 billion. In recent developments, Vanguard has expanded its fixed income offerings through multiple ETF launches managed by its Fixed Income Group, including the Core Tax-Exempt Bond ETF and Short Duration Tax-Exempt Bond ETF in November 2024, Intermediate-Term Tax-Exempt Bond ETF and California Tax-Exempt Bond ETF in January 2024, and Long-Term Tax-Exempt Bond ETF and New York Tax-Exempt Bond ETF in May 2025, alongside advisory changes to select bond-related funds in December 2025.