When crisis strikes: Inside NATO’s largest medical exercise

July 8, 2026 - Defence Stories

Estimated read time: 1:59

What happens when cyberattacks strike hospitals, communications fail, and casualties surge across a NATO nation?

From June 8 to 20, 23 Canadian Forces Health Services (CFHS) personnel deployed to Estonia for NATO's largest multinational medical field training event: Ex VIGOROUS WARRIOR 2026 (VW26). Alongside approximately 2,000 military and civilian medical personnel from 38 Allied and partner nations, participants trained to respond to complex, fast-moving crises that push health systems to their limits.

From cyber threats to responding to a simulated attack on a NATO member nation, VW26 was designed to replicate the high-pressure, unpredictable environments that military and civilian medical teams could face in real-world, modern operations. Participants coordinated their efforts across multiple exercise locations in Estonia, including two civilian hospitals. This approach created the conditions to stress medical assets, field-test innovative medical solutions, and strengthen civilian-military interoperability-converting lessons into deployable capabilities.

"There are no shortcuts to readiness. Training in demanding, realistic, multinational environments alongside our NATO allies is essential to building the interoperability required for modern operations," said Brigadier-General Marilynn Chenette, Commander, CFHS Group. "Together with our valued partners, it's here we exercise and validate our capabilities to ensure we are collectively well prepared for complex, ever-evolving operational environments."

VW26 placed participating nations into a rapidly evolving crisis, beginning with a subtle but disruptive hybrid threat and escalating into full collective defence operations. In the opening phase, a fictional NATO nation faced widespread disruption from cyberattacks on critical infrastructure, communications outages, and coordinated disinformation campaigns, placing significant strain on civilian health systems. CFHS members trained to deliver care in degraded conditions: supporting overwhelmed services, managing patient surges, and maintaining continuity of care despite limited resources and uncertainty.

As the scenario escalated into a confirmed armed attack, NATO invoked Article 5, where an armed attack against one NATO member is considered an attack against all members, and each member is obligated to come to its assistance. In response, CFHS shifted rapidly to combat support operations alongside allied partners. Personnel established and operated multinational medical treatment facilities, managed high volumes of simulated casualties, and coordinated patient evacuation across shared systems with allied partners.

"As an Exercise Evaluator, I observed participants incorporating lessons learned from Ukraine into realistic training, such as using buildings and vehicles of opportunity throughout the battlespace. Allied and partner nations performed successfully across a dispersed operational environment while maintaining responsiveness and continuity of care," said Captain Laurie Johnstone, CAF Health Services Manager, Director of Health Services Operations. "Exercises like this help us to prepare to deliver efficient, life-saving medical support when it matters the most."

As operational environments grow more complex, exercises like VW26 ensure NATO medical forces remain agile, interoperable, and ready to respond. Together, Allies are advancing a collective medical capability that strengthens NATO's readiness for whatever challenges lie ahead.