The scenario presented to participants last week was straightforward in principle but difficult to resolve in practice. A soldier is injured overseas, receives immediate treatment at the scene and is evacuated by air over a long distance. When the aircraft finally arrives in Britain, the challenge is finding an available hospital bed. More than 100 military experts, clinicians and civil servants, joined by counterparts from the United States and Canada, spent the exercise working out who that someone is and what they would displace.

Ministers describe the wargame as the Strategic Defence Review's whole-of-society approach in practice. The phrase is fair, and it conceals an awkward fact. In this instance, society means a health service that has spent years operating with almost no margin. Hospital occupancy runs routinely above the 85 per cent level generally regarded as safe, and waiting lists still number in the millions. Any plan to receive military casualties is a plan to draw on capacity that civilian patients already depend on.

Ukraine explains why the planning is serious. Participants examined the challenges of expanding hospital capacity, keeping civilian access to care, delivering rehabilitation at scale and supporting mental health. Those are long-tail demands. A casualty who survives the first hours may need years of reconstructive surgery and prolonged rehabilitation, with psychological support running alongside. Rehabilitation and mental health services are among the most stretched parts of the system, and civilian patients already queue for them.

There is also a question of institutional memory. During the Cold War, health planners assumed hospitals could be reorganised quickly to receive mass casualties, and the machinery for doing so existed, at least on paper. Much of that knowledge has thinned. For a generation, executive attention in the NHS has gone to waiting times, industrial action and financial recovery, while emergency preparedness has been managed as a specialist function. The presence of a National Director for NHS Resilience at the exercise signals recognition of the gap. A director cannot create a bed.

The relevance to current politics is direct, though contingent on decisions not yet taken. Defence planning must be tested against a civilian system whose margins are set by spending reviews and productivity targets rather than by the threat environment. The risk is that resilience becomes a document each side assumes the other has resourced. Defence expects the NHS to receive returning casualties. The NHS has been told to run its assets harder. Both instructions cannot be met in full without additional money or explicit trade-offs. Exercises expose such assumptions cheaply, which is their value, and further sessions in the coming months are welcome.

For NHS leaders, the immediate task is to establish what their organisations would be asked to absorb and whether it appears in board risk registers. Trusts in regions that would receive casualties need to know the numbers, the specialties involved and the expected duration of care. For policymakers, the harder task is to accept that surge capacity looks like inefficiency until the day it is needed. A funding settlement that rewards high occupancy should include a defined line for resilience, with accountability attached.

Industry has a role as well. The Defence Medical Command innovations mentioned in the exercise, including dried blood products, tranexamic acid autoinjectors and portable ultrasound, have clear civilian uses in trauma care and rural emergency response. Supply chains built for defence could also strengthen NHS procurement if the two systems are planned together. Developers of uncrewed evacuation and field diagnostics will find the most credible market where military and civilian requirements overlap.

Patients are owed clarity. Officials have said civilian care will continue whatever the circumstances, and that is the right commitment. It will carry weight only if it is quantified, with a clear account of which services would be protected and which would bend. Public trust in the health service is already fragile, and it would not survive the discovery that a promise made in a wargame had never been costed.

An exercise can show where plans fray. It cannot supply capacity. The measure of last week's wargame will be whether its findings reach the next spending settlement. Until then, the first bed in the scenario belongs to someone already waiting for it.

‍