AMERICAN SECURITY <ASEC> BUYOUT COMPLETED Maryland National Corp <MDNT> said it has completed the acquisition of American Security Corp in an exchange of 0.81 Maryland share for each of American's 12 mln shares outstanding. The company said the mandatory 30-day review by the U.S. Justice Department was completed today. Maryland National said American Security shareholders will be entitled to receive the 32-1/2 ct per share Maryland National regular quarterly dividend that is payable March 31 to holders of record today.