U.S. and NATO forces concluded a joint exercise focused on coordinating defense of the alliance’s eastern border, a priority for European nations responding to heightened Russian activity.

The Avenger Triad drills, held at the Grafenwoehr Training Area in Germany, involved approximately 4,000 personnel from U.S. Army Europe and Africa and NATO Allied Land Command.

Unlike conventional field exercises, Avenger Triad centered on headquarters operations that plan and synchronize military actions.

Participants evaluated a system linking sensors, shared battlefield data and artificial intelligence to support cross-border coordination.

Troops from command posts in Germany, Poland, France and the Netherlands took part, with U.S. and allied units evenly represented.

Brig. Gen. Thomas Lowin, NATO Allied Land Command’s deputy chief of staff for operations, stated that the exercise tested an approach to ensure troops could be supplied, reinforced and protected while maintaining links with other NATO commands.

Despite reliance on artificial intelligence, Lowin emphasized that final decisions rested with human commanders.

“The machine makes a recommendation,” he said. “We, as the staff, examine that recommendation and prepare it. The decision is made by our commander.”

Russia’s 2022 full-scale invasion of Ukraine has intensified NATO’s efforts to strengthen deterrence along its eastern flank.

The exercise aligned with the Eastern Flank Deterrence Initiative, which aims to reinforce defenses through layered barriers, sensors, weapons systems and interconnected communications networks.

The initiative seeks to degrade an adversary’s capabilities before large-scale allied troop deployments occur.

Physical obstacles such as anti-tank barriers and natural terrain features, combined with threat-detection sensors, are being integrated into the strategy.

Some capabilities are already operational.

Within a combined operations and intelligence center, American and allied personnel processed battlefield information, generated recommendations and coordinated operations across Europe.

The scenario simulated combat across a region stretching from northern Norway to the Black Sea, requiring coordination over thousands of miles.

Maj. Brian Hobeck, of the combined Theater Land Component Command, monitored simulated operations and briefed senior commanders on developments.

Cloud-based platforms and artificial intelligence were used to aggregate data from participating units and present commanders with response options.

Challenges arose due to differences in allied communications systems, software and security protocols.

This year’s exercise expanded its scope across NATO’s northern, central and southeastern operational zones, fostering stronger collaboration among joint headquarters.

During Avenger Triad, headquarters of V Corps, the 2nd Polish Corps, the 1st French Corps and the 1st German-Netherlands Corps exchanged information via a shared digital network using standardized data-sharing procedures, according to USAREUR-AF.

The exercise connected to NATO’s broader Steadfast Duel exercise, which involved roughly 8,000 military and civilian personnel across all 32 NATO member nations.

Allied forces tested a digital network designed to transmit information from sensors to human decision-makers and ultimately to weapons systems.

One tool employed was the Maven Smart System, which merged simulated battlefield data with live inputs including weather, terrain and sensor feeds.

Hobeck described a scenario in which Maven detected movements suggesting enemy reserve forces were being deployed.

Staff reviewed the data and prepared options for commanders, including reinforcing friendly positions.

Maven also enabled comparison of friendly and opposing force strengths and modeled potential outcomes of different operational choices.

Lowin underscored the importance of building resilient cooperative relationships, noting that deterrence effectiveness depends on the ability to operate even when established procedures fail or communications are disrupted.

“The more credible our deterrence is, the less likely it becomes that someone will attack us,” he said.