On 3 June 2026 U.S. European Command announced that it was reducing the manned and unmanned aircraft and the naval vessels it pledges to the NATO Force Model, on the stated ground that “The potential reality of simultaneous conflict in multiple theaters demands it.” Fifteen days later the U.S. Department of War opened a six-month review of American force posture and basing in Europe, and on 27 August its policy chief told the North Atlantic Council that the review was already running, with terms of reference and a detailed questionnaire in allied capitals. Against that timetable Europe has money: European allies and Canada invested more than USD 574 billion in defence in 2025 at 2021 prices, 2.3 per cent of their combined GDP, after a 20 per cent real increase in a single year, and the European Union has authorised up to €150 billion of repayable loans for joint procurement. What Europe does not yet have is the conversion. An additional fighter squadron, missile battery or brigade does not by itself replace the intelligence architecture, command system, tankers, strategic transport, targeting chain, satellite services, maintenance network, ammunition stocks or reinforcement machinery that make a formation operationally useful. The question is therefore not whether European governments will spend more, but whether the functions on which their forces depend can pass into European hands faster than American availability contracts — and what happens in the interval if they cannot.
This report proceeds in five movements: how simultaneity entered Alliance planning as an operative criterion rather than a scenario; a function-by-function inventory of what the United States supplies, from theatre command and airborne early warning to ballistic-missile defence, strategic lift, space services and the nuclear architecture; the European procurement and financing response, instrument by instrument; the interval between authorised money and operational capacity; and the question of whether national incentives are producing common functions or parallel inventories. The primary record worked for it comprises the U.S. European Command statement of 3 June 2026 and the Department of War’s review announcement and North Atlantic Council remarks; the Ankara and Hague Summit Declarations and NATO’s own accounts of Allied Command Operations, airborne early warning, strategic airlift, integrated air and missile defence, ballistic-missile defence and nuclear forces; Council Regulation (EU) 2025/1106 establishing SAFE and Regulation (EU) 2025/2643 establishing the European Defence Industry Programme; the European Court of Auditors’ special report on military mobility; European Investment Bank financing decisions; and the published results and capacity statements of Hensoldt, MBDA and Rheinmetall. Four statistical annexes accompany it. The report does not forecast an American withdrawal, does not price defence equities, and does not attempt a numerical comparison of classified capabilities. Where the public record cannot settle a question — the wartime allocation of pooled fleets, interceptor stock depth, the balance of targeting capacity — it says so and stops, because the alternative is a false precision that would not survive contact with the decisions it is meant to inform.