NEW YORK (Standard&Poor's) Feb. 26, 2015--Standard&Poor's Ratings Services today said it assigned its 'BB+f' fund credit quality and 'S3' volatility ratings on the iShares U.S. Fixed Income Balanced Risk ETF. The fund's investment objective is to generate total return and capital preservation. The fund seeks to achieve its investment objective by investing, under normal circumstances, at least 80% of its net assets in U.S. dollar-denominated investment-grade and high-yield fixed-income securities. The fund primarily invests in fixed-rate securities of varying maturities, such as corporate bonds, including U.S. dollar-denominated securities of foreign issuers, U.S. Treasuries, privately issued securities, and mortgage-backed securities. The fund may enter into TBA (to be announced) transactions on a regular basis with respect to