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Individual TSP Funds. 1  G Fund - Government Securities fund. The G Fund (think G for government securities) is invested in very short-term U.S. Treasury securities (bonds) guaranteed by the federal government. 2  F Fund - Fixed Income Index fund.
Now with the addition of a Roth TSP, there's another compelling reason for service members to start or increase what they're saving for retirement. The TSP is the federal government's version of a 401(k). It allows participants to invest money for retirement through payroll deductions.