THIS ACTION IS BASED UPON DEF REMOVAL OF CATALYTIC CONVERTERS FROM 14 MOTOR VEHICLES. CONVERTERS WERE REMOVED FROM VEHICLES BEING CONVERTED TO FOUR WHEEL DRIVE. THE REMOVAL WAS PERFORMED BY A MEMBER OF DEF WORK CREW W/O THE KNOWLEDGE OF THE DEF/OWNER. CREW MEMBER REMOVED CONVERTER AS A CONVENIENCE TO WORKER SINCE JOB WAS FASTER IF CONVER-TE R NOT REPLACED AFTER CONVERSION PERFORMED. CREW MEMBER FIRE D ONCE DEF/OWNER FOUND LEARNED OF THESE ACTIVITIES.