This bill extends and expands an existing military cybersecurity cooperation program with Southeast Asian countries. Originally established in 2021 to work with Vietnam, Thailand, and Indonesia on defensive cyber capabilities, the legislation adds the Philippines and Malaysia to the partnership and extends the program's deadline from December 31, 2024 to December 31, 2029. The bill modifies the program to focus specifically on defensive cyber cooperation rather than broader cyber initiatives and updates reporting and certification requirements to reflect the expanded list of partner nations. The legislation affects the Department of Defense and the military forces of five Southeast Asian countries that will participate in joint cyber training, capacity building, and security cooperation activities. No specific funding amounts are mentioned in the bill text, as it primarily amends existing authority rather than appropriating new funds.