This National Security Group is keeping homeowners safe in the South. The company's subsidiaries, Omega One Insurance and National Security Fire and Casualty, sell property/casualty insurance in about a dozen southern states. Most of National Security Group's revenues are generated by its residential premiums from homeowners and mobile homeowners policies. The unit also offers personal nonstandard automobile insurance. Its life insurance subsidiary, National Security Insurance, offers basic life, health, and accident insurance. Alabama and Mississippi together account for about half of the company's sales.