OLDWICK, N.J.--(BUSINESS WIRE)--AM Best has affirmed the Financial Strength Rating of A+ (Superior) and the Long-Term Issuer Credit Ratings (Long-Term ICR) "aa" of the life/health subsidiaries of Delphi Financial Group, Inc. (DFG) (Wilmington, DE): Reliance Standard Life Insurance Company (Schaumburg, IL) and First Reliance Standard Life Insurance Company (New York, NY) (together referred to as Reliance Standard), as well as DFG's property/casualty subsidiaries: Safety National Casualty Corpora