The fund invests in a portfolio generally consisting of U.S. Treasury securities and U.S. government agency securities with maturities of not less than one year and not more than three years, and related derivative contracts. It buys and sells portfolio securities based primarily on its market outlook and analysis of how securities may perform under different market conditions. The fund will invest its assets so that at least 80% of its net assets (plus any borrowings for investment purposes) are invested in U.S. government investments.