This special 5th Anniversary issue of Submarine Telecoms Forum, published in November 2006, explores the theme of Defense & Non-traditional Cable Systems. The issue delves into the timely subject of submarine cable systems in the context of global defense and non-traditional applications, amidst geopolitical tensions in regions like the Korean Peninsula and the Middle East. It features profiles on organizations such as the Comprehensive Test Ban Treaty Organization, insights into the US Navy's new cable support office, and updates on significant projects like the NEPTUNE scientific cable initiative. Contributors also discuss the offshore electricity market and the role of cable systems in wartime communication. This edition aims to provide a comprehensive view of the evolving submarine cable landscape, encouraging industry engagement and thought-provoking discussions.