Estimating the Cost of Combat Operations Against Iran

… April 8, 2026. Since then, the conflict has generally become less intense. DoD continued to refer to the conflict as Operation Epic Fury after the ceasefire agreement was reached but later ceased to do so. To minimize confusion, this letter refers to the entire conflict as Operation Epic Fury. Hon. Brendan F. Boyle Page 2 DoD’s Operational, Logistical, and Sustainment Costs. CBO estimates that as of August 1, 2026, the armed conflict with Iran has cost DoD approximately $38 billion. That amount reflects the costs of replacing expended munitions and equipment lost in battle, increased flying hours, other operations, and increased fuel costs. It also reflects that the initial, intense phase of the conflict lasted just over a month (less intense combat operations are still ongoing) and that relatively few U.S. forces have been involved compared with the much larger and longer U.S. operations in Iraq …