Two Models of Military Power: Iran and the United Kingdom

Few comparisons in contemporary strategic analysis are as instructive or as uncomfortable for Western audiences as the contrast between pre-2026 Iran and the United Kingdom. One a sanctioned, isolated revolutionary state running on 40-year-old fighter jets; the other a founding NATO member, nuclear power, and permanent member of the UN Security Council. Yet measured by the categories that matter most in the current era, innovation, societal commitment to defense, strategic coherence, and cost-effectiveness per unit of power projection, the comparison does not come out as tidily in Britain’s favor as most observers assume.

The Iranian Model: Scarcity as a Design Principle

Iran’s strategic situation after 1979 was one of near-total isolation from the international arms market. Unable to buy its way to military power, Tehran was forced to do something harder and ultimately more interesting: it had to think its way there. The result, developed over four decades, is a military architecture organized around what might be called a philosophy of asymmetric mass — the deliberate fielding of enormous quantities of cheap, capable systems to overwhelm the cost economics of Western air defense.

The Shahed-136 loitering munition costs between $20,000 and $50,000 to build, has a range of up to 2,000 kilometers, and carries precision guidance. The interceptors required to shoot it down can cost between $3 million and $12 million each. This is not merely a hardware advantage. It is a fundamentally different theory of warfare, one that places defenders permanently on the wrong side of the cost curve. Even if defenders can shoot down up to 80 percent of drone barrages, the remainder getting through at scale can mean a large number of damaging strikes and the attacker can simply produce more drones faster than the defender can produce interceptors.

The institutional vehicle for this innovation was the Islamic Revolutionary Guard Corps. Iran’s military strategy is framed around asymmetric warfare and emphasizes proxy conflicts, irregular naval tactics, a robust ballistic missile program, and cyber operations. The IRGC was not merely the executor of this strategy but its architect and research engine, developing domestic capability under sanction precisely because there was no alternative. Even before the 1979 revolution, Iran sought to develop an indigenous defense industry, both as an insurance policy against unreliable foreign suppliers and as a way to showcase its technical acumen.

The result was a military that operated well beyond its nominal borders. Iran extends military influence without deploying conventional troops, supporting Hezbollah, the Popular Mobilization Forces in Iraq, the Houthis in Yemen, and Liwa Fatemiyoun, conducting operations through IRGC Quds Force advisors and logistic networks. This proxy architecture allowed Iran to impose costs on adversaries across a theatre stretching from the Mediterranean to the Red Sea using other nations’ territory and other groups’ fighters. The power-projection economics were extraordinary: Iran achieved strategic depth at a fraction of what a conventional forward deployment would cost.

The missile program represented the other pillar of Iranian strategic innovation. Iran’s missile forces compensate for its weak air force by enabling long-range strikes through short- and medium-range ballistic missiles, land-attack cruise missiles, and unmanned aerial vehicles. Among the most prominent missiles is the Khorramshahr-4, with a range of 2,000 kilometers and a warhead weighing 1,500 kilograms. Underground ‘missile cities’, dispersed, hardened, and mobile, made this arsenal difficult to eliminate in a first strike.

By early 2025, Iran was commissioning its first drone carrier vessel — the IRIS Shahid Bagheri, capable of deploying UAVs, unmanned surface vehicles, and anti-ship missiles, allowing Iran to replicate attritional drone and missile combat operations on a larger scale in the maritime domain. This was not a major power’s capability. It was a sanctioned state deploying commercial vessel conversion and asymmetric thinking to project naval power at a fraction of the cost of a conventional carrier strike group.

None of this is to romanticize the Iranian model. Its conventional air force was genuinely decrepit roughly 250 combat-capable aircraft, many predating the 1979 revolution, including aging F-4 Phantoms, F-5 Tigers, and a small number of F-14 Tomcats, with sanctions making maintenance and modernization increasingly difficult. The IRGC’s dominance bred institutional rivalry and corruption. The June 2025 Israeli-American campaign would expose real vulnerabilities in Iranian air defense and command resilience. Iran’s model was not without limits. But the limits were different from, and in some respects less existential than, Britain’s.

The British Model: A Major Power’s Institutions Without a Major Power’s Resources

Britain’s problem is structural and civilizational in character. It is not simply that the United Kingdom has spent less on defense over the past three decades, though it has. It is that British society has progressively disengaged from the concept of military commitment as an expression of national identity and purpose. The military has become, in the perception of British governing elites, a cost center to be managed rather than a strategic instrument to be invested in.

At its Cold War peak in 1955/56, the UK spent 7.6 percent of GDP on defense. Defence spending fell considerably throughout the following decades, especially after 1984/85, and at a much faster pace after the end of the Cold War in 1991. At the start of the 1990s, there were approximately 300,000 personnel in the armed forces, falling to 200,000 by 2005, and to around 138,120 active personnel by 2024. That trajectory from 300,000 to 138,000 in three decades represents not a reform but a hollowing out.

Real-terms defence spending fell by 22 percent between 2009/10 and 2016/17. These were not strategic reductions: they were austerity decisions dressed in strategic language. The 2010 Strategic Defence and Security Review gutted the Army’s capacity in the name of fiscal discipline, closing recruiting offices and shedding experienced personnel at exactly the moment when preserving institutional knowledge was most critical.

The consequence was a structural recruitment crisis that now threatens Britain’s ability to field a credible war-fighting force at all. In 2023–24, the Army recruited 6,720 recruits against a target of 10,450 — 64 percent of goal. The Royal Navy achieved 2,450 recruits against a target of 4,040, 60 percent of goal. The RAF achieved 1,800 recruits against a target of 2,560, 70 percent of goal. The British Army recorded just 70,860 full-time trained soldiers, well below its 73,000 target, operating below its smallest historical level since the Napoleonic Wars.

The systemic nature of this decline is evident not merely in numbers but in culture. Voluntary outflow was the most common reason for leaving the Regular Forces, accounting for 62 percent of total outflow. A Commons Defence Committee report described the military as ‘consistently overstretched,’ with the demands of operations leaving personnel little time for warfighting training, while the Public Accounts Committee stated that the Ministry of Defence had no credible plan to fund the military capabilities the government wants.

Comparing the Philosophies: Exquisite Scarcity Versus Intelligent Mass

The conceptual divergence between the two militaries maps onto a tension that runs through all contemporary defense thinking. Britain, like most Western states, has pursued what might be called the exquisite scarcity model: a small number of extremely capable, extremely expensive platforms. Two Queen Elizabeth-class aircraft carriers. F-35B jets. The Trident nuclear system. These are extraordinary capabilities, but they are brittle. A single system failure, a production bottleneck, a recruitment shortfall among skilled maintainers — any of these can degrade operational readiness across a disproportionate share of the force.

Iran, operating under resource constraint and without access to Western technology, was forced toward the opposite pole: cheap, numerous, and expendable systems deployed at volume. The Shahed drone is not as capable as any Western precision munition. But it exists in the thousands, it can be produced domestically, it can be operated by irregular forces, and it has already demonstrated the ability to reduce Red Sea maritime traffic by over 90 percent through proxy employment. The kill-chain logic of Western air superiority was not overcome. It was simply bypassed by generating a volume of threats that overwhelmed the cost math of interception.

This is a profound strategic lesson, and one that Britain has been conspicuously slow to absorb. The 2025 Strategic Defence Review acknowledged the recruitment and readiness crisis with considerable frankness, placing skills and workforce capability at the core of defence reform, while noting that delivering its recommendations would require defence spending of 3–3.5 percent of GDP. Britain’s government has committed to reaching 2.5 percent of GDP by 2027 and 3.5 percent by 2035, targets that, if met, would represent a genuine reversal of decades of decline. The question is whether the political will exists to sustain that commitment through multiple electoral cycles.

The Societal Dimension: What a Nation Is Willing to Pay For

Perhaps the most underexamined dimension of this comparison is societal rather than budgetary. Defense spending as a percentage of GDP is a proxy for something deeper, the degree to which a society regards its own security as a public good worth paying for, as opposed to a residual claim on resources left over after welfare, consumption, and debt service.

Iranian society under the Islamic Republic organized itself, however coercively, around a garrison-state logic that made military investment a first-order priority. Between 2015 and 2019, Iran annually spent 4 to 5 percent of GDP on defense, while the IRGC received proportionally twice the funding of the regular military, reflecting a deliberate channeling of national resources into the instruments of power projection even as ordinary Iranians suffered the economic consequences. The system was repressive and opaque. But it produced a real military capability that surprised adversaries repeatedly.

Britain, by contrast, has operated under a tacit political consensus since the 1990s that defense is essentially solved that alliance membership, nuclear deterrence, and residual conventional capability are sufficient for a medium power in a broadly benign security environment. The Ukraine war cracked that consensus; the broader arc of authoritarian revisionism — Russia, China, Iran, North Korea operating in growing coordination — is shattering it. But the structural response remains lagged, tentative, and hostage to fiscal pressures that Britain’s political class has shown little appetite to confront honestly.

What Remains

The comparison is not simply an indictment of Britain or a celebration of Iran. Britain retains genuine strategic capabilities that Iran never possessed and never will: a nuclear deterrent, a global intelligence network in the Five Eyes partnership, interoperability with the United States military at the highest levels of integration, a carrier strike group that represents real power projection capability, and a defense industrial base, however stressed, that includes BAE Systems, Rolls-Royce, and participation in the GCAP next-generation fighter program. These are not trivial assets.

Nor should the Iranian model be taken as replicable by a democracy. The garrison-state logic that sustained Iranian military investment was inseparable from authoritarian control, ideological mobilization, and suppression of civil society. A liberal democracy cannot and should not adopt those methods. But it can ask whether its current level of investment in its own security reflects an honest assessment of the threat environment or a comfortable evasion of an uncomfortable question.

The answer, in Britain’s case, is clearly the latter. For three decades, successive British governments chose to consume the post-Cold War peace dividend long after that dividend had expired. The result is an army below Napoleonic-era strength, a recruitment system so dysfunctional that it takes 249 days on average to process an application, and a strategic posture essentially dependent on American willingness to underwrite European security indefinitely.

Iran, for all the brutality and opacity of its system, asked a different question: given what we have, what can we build?

The answer turned out to be a drone ecosystem that reshaped the economics of air warfare, a missile arsenal that threatened every American base in the Middle East, and a proxy network that extended Iranian strategic reach across six countries.

It was an achievement born of necessity but it was an achievement.

Britain’s declining military capability is not born of necessity. It is born of choice.

That distinction is the sharpest lesson this comparison has to offer.