Preventive Maintenance, Emergency Repair, Technical Support Center services, training, Parts support, and related support services for existing Advantor-manufactured Electronic Security System (ESS), ... Preventive Maintenance, Emergency Repair, Technical Support Center services, training, Parts support, and related support services for existing Advantor-manufactured Electronic Security System (ESS), Intrusion Detection System (IDS), and Electronic Entry Control System (EECS) equipment across Air National Guard installations.