The investment seeks to maximize current income and achieve above average total return consistent with prudent investment management over a full market cycle. The fund invests at least 80% of net assets in debt securities. It may invest primarily in mortgage-backed securities of any maturity or type guaranteed by, or secured by collateral that is guaranteed by, the United States Government, its agencies, instrumentalities or its sponsored corporations, and in privately issued mortgage-backed securities rated Aa or higher by any nationally recognized statistical organization.