Exercise Excellence: Michigan Reflects on a National Level Exercise Exercise Excellence: Michigan Reflects on a National Level Exercise Adrianna Evans Learn how Michigan's health department collaborated with state and federal partners for a radiation preparedness exercise. In March 2025, the Department of Energy hosted a national level exercise designed to promote radiation readiness. This exercise, called Cobalt Magnet 25, brought together a wide variety of interdisciplinary partners from federal, state, local, and international governments, among other partners. Michigan hosted the exercise. ASTHO’s Director of Preparedness, Adrianna (Annie) Evans, sat down with representatives from the Michigan Department of Health and Human Services (MDHHS) to learn about their experiences with Cobalt Magnet 25, how they’ve applied lessons learned one year later, and how those lessons might be applied to different threats. This blog post will be the first in a series “Exercise Excellence” that shares insights and perspectives from emergency preparedness exercises. This first blog post will share insights from Michigan on Cobalt Magnet 25 overall preparation, planning, collaboration, and more. Tell us about your experience with Cobalt Magnet 25. Jason Smith, Emergency Management Coordinator: While Michigan State Police, our state’s emergency management agency, took a key role with the U.S. Department of Energy on lead exercise planning, MDHHS served as lead exercise planner, player, and co-chaired a public health and environment working group alongside partners from Ontario and the Michigan Department of Environment, Great Lakes, and Energy. MDHHS leveraged this opportunity to initiate internal play and engage local public health and health care partners across the region. This included representation from two health care coalitions, five local health departments, and four major health care systems — many of which were outside the directly affected communities for this scenario. MDHHS activated our emergency coordination center. Overall, the Cobalt Magnet 25 Full Scale Exercise featured over a thousand injects emphasizing field sampling, decontamination, and reception centers. Our participation spanned preparedness, laboratory, environmental health, behavior health, disability health, and communications, including our public information officers. This experience strengthened cross-jurisdictional coordination and enhanced MDHHS's operational readiness for radiological incidents. Terra Riddle, Director, Division of Emergency Preparedness and Response: From my perspective, Cobalt Magnet 25 was impressive. Each player jurisdiction had the opportunity to make the exercise meaningful. It was really great to see all the partners come together and how each jurisdiction worked through these scenarios. It was unique in the communications world due to the depth, richness, and realness of the exercise play. Jay Fiedler, Director, Bureau of Emergency Preparedness, EMS, and Systems of Care: I participated when the larger group convened as part of the planning process. I hadn't seen something like this before in an exercise of this caliber. One of those activities was a briefing held for departmental leadership of state and federal agencies leading into the full exercise. I also served in the response coordinator role in our Community Health Emergency Coordination Center during the exercise itself. What was the preparation and planning process like for this exercise? Fiedler: This was roughly a yearlong planning process facilitated by a federal contractor, but it required extensive engagement with our state and federal partners. Jason worked in regular planning meetings and activities throughout that year. Some ways that the players were pulled together in meetings leading up to the exercise were really valuable for creating partnerships. Our partners from Ontario joined us. We don’t always get to work with them. That helped facilitate enthusiasm for the exercise itself and enhanced coordination between all the players involved. Smith: In addition to the exercise planning itself, the beauty of Michigan hosting Cobalt Magnet 25 was the opportunity to capitalize on existing trainings, whether it be through Counter Terrorism Operations Support, general radiological emergency preparedness training, and programs through CDC — primarily their public health decision-making course for radiological emergencies. There was a lot of training going on behind the scenes to build up awareness and capacity over the year. I thought the education opportunities made the exercise itself a success. Riddle: I'm glad you mentioned that, Jason, because it brought up another thought about the in-depth training led by the federal partners in the communications world. They invited our partners at the state and local levels to participate in radiological and communications training that was pretty niche. Our partners appreciated that this training prepared them for the exercise and it has spurred lot of conversation since about where we go next. This type of scenario requires a lot of collaboration with government agencies across levels of government, different fields, and even other countries. How did you manage that collaboration and what lessons did you learn? Riddle: The big takeaway is that trust built before a crisis sustains coordination during a crisis. This exercise required management across local, state, federal, and international partners with clear roles, consistent communication channels, and shared objectives early on. Fiedler: The pre-meetings were a unique aspect of this exercise and the connections built were really valuable. I hadn't seen that until an exercise of this scope and scale, but will be helpful going forward as we think about how we work and plan exercises as a whole. Smith: One lesson learned was that there is a bigger appetite for training, both in our department and local partners. Michigan has three nuclear power plants. That prevailing threat does build some desire for general awareness throughout the state, particularly among our 45 health departments. We also realized we need to work a little bit more collaboratively with our environmental partners, our agricultural partners, and have a more unified response effort. Riddle: If I can add, there's always an appetite for training and for support for our local partners, but Cobalt Magnet 25 brought visibility into different types of training. Jason explored radiological training. We explored communications training. Now I wonder all the time if there is a partner that could offer new trainings that we haven’t done before. What’s next for MI? Does MI have any other upcoming exercises — radiological/nuclear or otherwise — that you’re looking forward to? Smith: We’re focusing on a comprehensive overhaul of our response plans — not only our radiological nuclear hazards, but also for other functional and hazard specific annexes. In February 2026, we worked with our emergency management agency, local health departments, and health care coalition partners on a severe weather functional exercise. We also have a few workshops and tabletops scheduled for spring 2026 on volunteer management and vector-borne diseases. Additionally, we're prioritizing One Health coordination and formal agreements with agriculture and environmental agencies to strengthen collaboration across the quality-of-life sector. Lastly, we have a climate change tabletop exercise planned in partnership with environmental health teams within MDHHS. These initiatives reflect our commitment to building resilience across multiple hazards while continuing to advance radiological preparedness. Riddle: The depth of relationships continue to be a leading priority. Regardless of the emergency, our teams working together will be our strength. We're all interconnected and that plays into different activities. For example, our patient movement work, which inherently has many partners and requires close coordination like we saw with Cobalt Magnet 25. Exercise Excellence - Radiation Resources article yes