Exhibit 21 LIST OF SUBSIDIARIES The following are subsidiaries of the Company, respective jurisdictions of their incorporation and names (if any) under which they do business. The Company owns all of the voting securities of each subsidiary. NAME UNDER WHICH JURISDICTION OF SUBSIDIARY DOES NAME INCORPORATION BUSINESS - ---------------------------------------------------------------------------------------------- NAI Technologies-- New York NAI Systems Division Systems Division Corporation Wilcom, Inc. New York Wilcom, Inc. Lynwood Scientific United Kingdom Lynwood Developments Ltd. Arathon V.I., Inc. U.S. Virgin Islands Arathon Codar Technology, Inc. Colorado Codar