On November 6, the National Association of Insurance Commissioners (NAIC) announced that its members approved a proposal to develop a new model for determining the regulatory treatment of RMBS, which will produce ratings designations for approximately 18,000 insurer-owned RMBS. These ratings designations will apply to year-end 2009 reporting and will replace ratings designations from NRSROs which, until now, have been used by regulators to score RMBS for solvency regulation. NAIC Release. NAIC Proposal.