NATO’s largest annual anti-submarine warfare exercise, Dynamic Mongoose 2026, concluded on 29 May in the Norwegian Sea, bringing together forces from nine Allied and Partner nations under Norwegian host command. The two-week exercise, led by NATO’s Allied Maritime Command (MARCOM), focused on integrating submarines, surface ships, helicopters, Maritime Patrol Aircraft and autonomous systems to train and test anti-submarine detection and response capabilities in the High North.
Dynamic Mongoose 2026 was conducted as part of Arctic Sentry, NATO’s broader framework for reinforcing presence and readiness in the Arctic and High North. Standing NATO Maritime Group One (SNMG1), already operating in the region, participated alongside Allied forces. Crews alternated between hunter and evader roles in realistic “cat and mouse” scenarios, testing coordination across air, surface and sub-surface assets.
Royal Navy Commodore Maryla Ingham, Commander SNMG1, described the exercise as a success, noting that forces had “proved the successful integration of advanced capabilities and technologies, as well as refining and refreshing our tactics, techniques and procedures, during an increasingly complex series of exercises against live submarines.” She added that the exercise demonstrated “our will and ability to deter and, if necessary, defend the Alliance.”
The exercise took place in an area of growing strategic relevance. The Norwegian Sea and adjacent North Atlantic approaches are central to NATO’s ability to secure maritime links between North America and Europe. As offshore energy infrastructure — including wind farms — expands across the North Sea and Baltic, the security of the wider maritime environment has become increasingly relevant to the energy sector.
SNMG1 is one of four standing NATO maritime groups providing continuous maritime presence and readiness in peacetime, crisis and conflict. Exercises such as Dynamic Mongoose contribute to Allied assurance measures and enhance multinational interoperability across the North Atlantic, the Baltic Sea and the Arctic approaches.
