The investment seeks to provide current income consistent with capital preservation. The fund normally invests at least 80% of assets in U.S. government obligations; and up to 20% of the assets in non-government mortgage- and asset-backed securities. It purchases only securities that are rated within the two highest rating categories assigned by a Nationally Recognized Statistical Ratings Organization. Generally, the portfolio's overall effective duration is less than that of a 3-year U.S. Treasury note.