THE ARMY ADAPTED A COMMERICAL DETECTOR TO MILITARY SPECIFICATIONS. THE 'MILITARIZED' UNIT, WHICH CONSISTS OF A WALK-THROUGH ARCHWAY, AN ELECTRONIC CONTROL CONSOLE, AND AN EMERGENCY BATTERY POWER PACK, WAS PERFORMANCE-TESTED IN AN AIRPORT, AND SUBJECTED TO ENVIRONMENTAL (VIBRATION, SHOCK, TEMPERATURE, HUMIDITY) AND ELECTROMAGNETIC SUSCEPTIBILITY TESTS. THE DETECTOR PROVED VERY INSENSITIVE TO OUTSIDE INTERFERENCE. ITS NARROW ARCHWAY MAKES THE UNIT PARTICULARLY EFFECTIVE IN SINGLING OUT ARMED PERSONS IN CROWDS. THE REPORT INCLUDES BOTH SUMMARIES AND DETAILS OF THE DEVELOPMENT AND TESTING PROGRAM, PLUS DRAWINGS AND DETAILED DESCRIPTIONS OF THE UNIT AND ITS COMPONENTS. (LKM)