For the first day of the 27th ASEAN Regional Forum Heads of Defence Universities, Colleges, and Institutions Meeting, the National Defence University of Cambodia, as the host and co-chair together with the Canadian Defence Academy, organized presentations from seven countries: Cambodia, Canada, China, Indonesia, Japan, Russia, and Vietnam. These presentations covered two important sub-themes: 1. Climate-Induced Migration and Its Security Implications, and 2. Military Preparedness and Response to Environmental Disruptions.