The CBO says a significant share of the spending has gone toward weapons and ammunition, which have been used at a high rate during the war.
The budget office estimates that it could take up to five years for the United States to replenish its weapons stockpiles to the levels they were at before the conflict.
The war could also have wider consequences for the US economy.
The CBO estimates that the conflict could increase inflation by 0.5% during the first three months of 2027. Attacks affecting the Strait of Hormuz and energy infrastructure in countries in the region have also contributed to rising energy prices.
The report further warns that declining stocks of key weapons, including missile interceptors, could reduce the United States’ ability to respond to another major conflict if one were to occur.
The CBO specifically cited the possibility of a future conflict involving China and Taiwan as an example of a scenario that could place additional pressure on US military resources.
The Department of Defense, however, has rejected concerns about weapons shortages, saying it still has sufficient equipment to carry out President Donald Trump’s military plans.
So far, 18 US service members have been killed in the war.
Meanwhile, US government debt surpassed $40 trillion in August, adding to broader concerns over the country’s fiscal position as military spending continues to rise.
