The Coastwatchers of the British Empire remain one of the most remarkable examples of integrated local knowledge, intelligence gathering, and unconventional warfare in the Pacific. From the early warning at Guadalcanal to the rescue of downed airmen and the coordination with Allied forces, these networks demonstrate how individuals and communities can influence the strategic balance of war. Yet their legacy extends beyond history — it provides enduring lessons for how small forces, indigenous partners, and maritime surveillance can contribute to modern security challenges.