On August 5th, the Federal banking and credit union regulators issued joint guidance in response to the decision of S&P's rating agency to lower the long-term rating of the U.S. government and federal agencies from AAA to AA+. For risk-based capital purposes, the risk weights for Treasury securities and other securities issued or guaranteed by the U.S. government, government agencies, and government-sponsored entities will not change. The treatment of Treasury securities and other securities issued or guaranteed by the U.S. government, government agencies, and government-sponsored entities under other federal banking agency regulations, including, for example, the Board's Regulation W, will also be unaffected. Joint Guidance.