The 6th Asian Conference on Defense Technology (ACDT 2019) is an international symposium that covers major areas of research, including Smart System, Security, Surveillance and Reconnaissance, Information Technology and Information System ; Chemical, Biological, Radiological and Nuclear (CBRN), Modelling and Simulation, Operation Research, Technology for Safeguard Operation, Defence Management, Military Specialty. The ACDT 2019 will be held in Bali, Indonesia. This conference aims to bring together people in research institutes, universities, and industries to enhance intellectual exchanges, discussion, and research collaboration. The conference will include tutorials and keynotes given by world-class speakers. Accepted papers will be published in the 6th ACDT Proceedings and submitted to IEEE Xplore.