Executive Summary
U.S. military operations against Iran have led to significant expenditure of munitions, causing strategic inventory shortfalls and revealing industrial base bottlenecks. The Congressional Budget Office estimates the cost to replace expended munitions through August 2026 at $21.7 billion, with some interceptors requiring at least five years to replenish. These shortfalls raise concerns about the U.S. ability to sustain operations and maintain a strong defense posture in other critical regions like the Indo-Pacific.
Why It Matters
This document is crucial for defense analysts as it details the significant expenditure of U.S. munitions in ongoing operations against Iran, highlighting critical inventory shortfalls and industrial base challenges that impact current and future military readiness and strategic posture.
Key Takeaways
- U.S. military operations against Iran have caused strategic inventory shortfalls and exposed industrial base bottlenecks for munitions resupply.
Source evidence · PDF page 1
The DOD Office of Inspector General, citing the DOD Office of the Under Secretary for Acquisition and Sustainment, stated that “the munitions expenditure in [Operation Epic Fury] has resulted in strategic inventory shortfalls and revealed industrial base bottlenecks for munitions resupply” and that the “defense industrial base requires ‘significant lead time’ to expand production capacities.”
- Replacing expended munitions through August 2026 is estimated to cost $21.7 billion, with some missile interceptors requiring at least five years to replenish even with increased production.
Source evidence · PDF page 2
In September, CBO, citing reporting from publicly available sources on the quantities of munitions expended, estimated the cost to replace munitions expended through August 1, 2026, was $21.7 billion, including “$7.3 billion for the land-attack cruise missiles, $13.1 billion for the missile defense interceptors, and $1.2 billion for other munitions.”
- Depleted munitions stockpiles could create tactical and strategic vulnerabilities, potentially affecting the U.S. ability to sustain operations in Iran and maintain a strong defense in the Indo-Pacific.
Source evidence · PDF page 3
In the medium term, Congress may assess how depleted stockpiles may affect the U.S. ability to “erect a strong denial defense along the First Island Chain” in the Indo-Pacific, as described in the 2026 National Defense Strategy.
Strategic Relevance
The document highlights critical challenges in the U.S. defense industrial base and munitions stockpiles, directly impacting the nation's ability to sustain prolonged military operations and project power globally, particularly in contested regions like the Middle East and Indo-Pacific. This has significant implications for deterrence and alliance commitments.