NATO runs 15,500‑troop AI exercise

NATO is now doing something more ambitious than a big troop drill. It is using a live multinational exercise to test how artificial intelligence, drones, and shared command networks might actually work in a European fight. That is the point of Sword 26, the new U.S.-led exercise series that started on April 27 and runs through the end of May across eight countries on NATO’s eastern flank. It replaces Defender, but the bigger change is conceptual — this is less about proving troops can arrive, and more about proving allied forces can fight together under NATO’s regional defense plans. ### What is Sword 26, exactly? Sword 26 is U.S. Army Europe and Africa’s new flagship exercise in Europe. It links three drills — Saber Strike, Immediate Response, and Swift Response — across the High North, the Baltic region, and Poland. The exercise is built around NATO coordination. ### Why rename Defender? Defender, launched in 2020, was mainly about strategic movement — getting U.S.-based forces and equipment into Europe fast enough to reinforce allies. Sword keeps the multinational scale, but turns the emphasis toward in-place warfighting. In plain English, NATO thinks the harder question is no longer just “Can we get there?” but “Can we execute the plan once the shooting starts?” ### How big is this exercise? The numbers are substantial, even if they are not Cold War huge. Sword 26 involves around 15,500 troops from at least 11 countries, with about 6,000 from the United States and roughly 9,500 from allied nations. It spans eight countries and runs through May, which makes it one of the alliance’s bigger spring readiness events and a visible test of eastern-flank coordination. ### Where does the AI part come in? The AI piece is not “killer robots.” It is command-and-control acceleration. U.S. Army Europe and Africa says Sword 26 is testing AI-enabled command and control, live-data mission networks, multi-domain operations, and counter-drone systems. The idea is to fuse sensors, unmanned systems, and targeting tools so commanders can spot threats, decide faster without the usual lag. ### Why is faster decision-making such a big deal? Because modern combat punishes slow headquarters. If one side can connect sensors to shooters in minutes instead of hours, it can blunt an attack before massed forces build momentum. That is the promise behind these systems. Think of it less like replacing commanders and more like shrinking the time between seeing a threat and doing something useful about it. ### Is NATO already building this into training? Yes — and that is what makes Sword 26 more than a one-off demo. NATO’s Joint Warfare Centre has been integrating Maven Smart System into exercise planning and delivery, calling it the alliance’s first AI-enabled command-and-control capability, and bias mitigation. ### What is the catch? Interoperability. An AI tool is only useful if different militaries trust the data, can plug into the same network, and are willing to act on machine-assisted recommendations under pressure. The governance problem is just as real — NATO wants speed, but it also wants humans accountable for lethal decisions. That tension is not solved by running a drill, but the drill exposes where the weak spots are. ### So what changed this week? The alliance moved AI from strategy documents and lab demos into a large field exercise tied directly to NATO war plans. That is the real news. Sword 26 shows NATO trying to normalize AI as part of everyday operational planning, not as a futuristic add-on. If it works, allies get faster and more coherent on the eastern flank. If it does not, the exercise will show exactly where the seams still are.