The United States and Israel launched joint attacks on Iran starting last Saturday. According to the Washington DC-based think tank Center for Strategic and International Studies (CSIS), the United States spent $3.7 billion in the first 100 hours of the war, with a daily expenditure of $891.4 million. US President Donald Trump and Defense Secretary Pete Hegseth have both indicated that the conflict could continue for several weeks.

CSIS reported that the US Department of Defense will require additional funds beyond its current budget to sustain the war effort. The think tank also noted that shifting toward lower-cost weaponry could reduce overall expenses, as air operations are particularly costly and require advanced weapon systems.

The report further stated that at some stage, the Pentagon will need supplementary funding to maintain operations. The conflict has already caused significant damage in Iran, including civilian infrastructure losses and casualties, according to related reports cited in the source.