The Soaring Costs of Modern Warfare: A Financial and Human Toll
What defines modern warfare isn’t its brutality – that’s as old as war itself – but its accounting. Consider the figure circulating in Washington in early March 2026: not announced with fanfare, but revealed in a Reuters report. The US government had expended $5.6 billion on ammunition in the first 48 hours of its conflict with Iran.
$5.6 billion. For two days. For ammunition. Even as such a number might seem an exaggeration, a closer look at the price tags attached to modern weaponry reveals a financial obscenity. The New York Times reported that the first week of the conflict already cost the Pentagon over $11.3 billion.
Billion-Dollar Burn Rate
The weapons systems deployed by the US in Iran carry staggering price tags. According to Bloomberg, Patriot missiles cost $4.6 million apiece, SM-6 missiles $8.2 million, and THAAD missiles $12.8 million. The Tomahawk cruise missile, a mainstay of US air strikes, costs $1.7 million per unit. Early in the conflict, a US Tomahawk struck the Shajareh-Tayyebeh girls’ school in Minab, killing over 160 people, most of them young girls.
Modern air warfare financially resembles a grotesque pyrotechnic display, where each projectile costs as much as a garage full of Ferraris. Iran, however, appears to be utilizing munitions and drones costing only a few thousand dollars.
The Long Bill
These initial expenditures are merely the opening volley in a cascade of war costs. What governments categorize as military spending – ammunition, flight hours, fuel, and tactical operations – are only initial investments. The true costs of war become apparent in the quiet aftermath, after the last explosion.
The “Costs of War” project at Brown University tracks this financial reality. The project emphasizes that understanding the price of a US war requires looking beyond the Pentagon budget.
The true extent of a war, Brown University’s data shows, often reveals itself after the generals have retired. When factoring in veteran care, disability payments, long-term military presence, and the interest on debts incurred to finance these wars, the calculation changes dramatically. US military spending for Afghanistan, Iraq, and other post-9/11 operations totals over $2 trillion. Including other war-related federal expenses, the project estimates the total cost at over $5.8 trillion, potentially reaching $8 trillion when future obligations are included. These conflicts have already cost approximately 900,000 lives.
War’s Impact on Individuals
A significant portion of these costs relates to the often-overlooked consequences of war: broken bodies and minds. Harvard economist Linda Bilmes estimates that medical care and support for veterans of the Iraq and Afghanistan wars will cost between $2.2 and $2.5 trillion by 2050.
Bilmes points out that the peak of veteran care expenses doesn’t coincide with homecoming parades, but decades later, when the psychological wounds of war – particularly post-traumatic stress disorder – fully manifest.
Studies by the RAND Corporation, a think tank funded by the US Department of Defense, indicate that post-traumatic stress disorder, depression, and traumatic brain injuries are characteristic long-term consequences of the post-9/11 wars. Nearly half a million US soldiers have suffered traumatic brain injuries since the beginning of the 21st century.
The fiscal dimension of these consequences is enormous. The US Congressional Budget Office reports that the Department of Veterans Affairs paid out around $195 billion in disability and compensation benefits to over 6.9 million veterans and their families in fiscal year 2025.
Profits of War
Of course, some benefit. For every dollar America spends on conflict prevention through diplomacy, two dollars flow into the coffers of those who profit from war. Analysts William D. Hartung and Stephen Semler calculated that private companies received $2.4 trillion in Pentagon contracts between 2020 and 2024, roughly 54 percent of available military spending.
This money is concentrated among a few corporations. $771 billion went to just five defense companies: Lockheed Martin ($313 billion), RTX ($145 billion), Boeing ($115 billion), General Dynamics ($116 billion), and Northrop Grumman ($81 billion). In comparison, the US government spent $356 billion on its entire diplomatic, development, and humanitarian apparatus during the same period.
The Weight of Debt
These massive sums aren’t paid from a well-stocked treasury. As American bombers strike targets in Iran, a quieter machine operates in the background: debt service. In the first five months of fiscal year 2026 – from October 2025 to February 2026 – the US Treasury paid $433 billion in interest on the national debt, more than $20 billion per week, just to service existing debt.
The US war machine has operated on credit for decades. Wars have been financed primarily through borrowing. Approximately $2 trillion was borrowed to cover the immediate costs of war. This has already resulted in enormous interest costs: by 2020, approximately $925 billion in interest had accrued on these war debts. Even without new wars, these interest payments could reach $6.5 trillion by 2050.
Historically, this is unusual. Previous American wars were at least partially funded through taxes. Tax increases covered around 30 percent of the costs during World War I, nearly half during World War II, and the Korean War was fully funded through taxes. Post-9/11 wars, however, have been largely financed through debt.
FAQ
Q: What is the biggest cost of modern warfare?
A: Beyond the immediate financial costs of weapons and operations, the long-term costs of veteran care, debt servicing, and the broader economic impact are substantial.
Q: Which companies benefit most from war?
A: A small number of large defense contractors, such as Lockheed Martin, RTX, Boeing, General Dynamics, and Northrop Grumman, receive the majority of Pentagon contracts.
Q: How are wars financed in the US?
A: Primarily through borrowing, leading to significant national debt and interest payments.
Q: What is the “Costs of War” project?
A: A research project at Brown University that comprehensively tracks the financial and human costs of US wars since 9/11.
