US Commits 80% of JASSM-ER Missile Stockpile to Iran War

Introduction to Operation Epic Fury

The United States has significantly escalated its military campaign against Iran, codenamed Operation Epic Fury, by committing the vast majority of its advanced JASSM-ER stealth cruise missiles. This strategic move, initiated in late March 2026, involves drawing down stockpiles from other critical regions, including the Pacific, to support intensive operations in the Middle East. The decision underscores the high consumption rate of precision-guided munitions in modern warfare and raises significant questions about US military readiness for other potential global conflicts.

The Scale of Missile Deployment

According to individuals with direct knowledge of the situation, the US military has moved to commit nearly its entire pre-war inventory of approximately 2,300 JASSM-ER missiles to the Iran conflict. After the redeployment from bases in the Pacific and the continental US to US Central Command, only about 425 of these missiles will remain available for contingencies elsewhere. This remaining inventory is roughly enough for a single mission by 17 B-1B bombers. The first four weeks of the conflict alone consumed over 1,000 JASSM-ERs, highlighting the rapid pace of operations. An additional 75 units are considered unserviceable due to technical faults or damage.

JASSM-ER: A Key Standoff Weapon

The Joint Air-to-Surface Standoff Missile-Extended Range (JASSM-ER) is a critical asset in the US arsenal. Manufactured by Lockheed Martin Corp., each missile costs approximately $1.5 million and is designed to strike high-value, well-defended targets from a safe distance. With a range exceeding 600 miles (965 km), its stealth characteristics allow it to penetrate sophisticated enemy air defenses. These missiles are typically launched from long-range bombers like the B-1B and B-52, as well as from various strike fighters, minimizing risk to flight crews.

Strategic Implications and Production Challenges

The heavy reliance on JASSM-ER in the Iran campaign has exposed vulnerabilities in the US defense industrial base. The depletion of these critical munitions, originally stockpiled for potential conflicts with near-peer adversaries like China, creates a strategic gap. Replenishing the inventory will be a slow process. Lockheed Martin's scheduled production rate for 2026 is 396 units. While production can be ramped up to a maximum of 860 per year, it would still take several years to rebuild the stockpile to pre-conflict levels. This situation places immense pressure on defense manufacturing to accelerate output.

Combat Debut of the Precision Strike Missile (PrSM)

Operation Epic Fury has also served as the proving ground for the US Army's new Precision Strike Missile (PrSM). This ground-launched, short-range ballistic missile made its successful combat debut in the opening hours of the war, augmenting air and sea strikes. Fired from mobile M142 HIMARS and M270 MLRS launchers, the PrSM offers significant advantages over the older ATACMS missile it replaces, including a longer range (exceeding the previous 499 km treaty limit) and the ability to carry two missiles per launch pod instead of one. Its use against targets in southern and central Iran from allied bases in the Arabian Peninsula has demonstrated its effectiveness in striking time-sensitive targets like air defenses and command centers.

Iran's Military Response

Iran has responded to the US-led campaign with its own formidable missile arsenal. In a significant escalation, Iran launched ballistic missiles targeting the strategic US-UK base at Diego Garcia in the Indian Ocean, demonstrating an unprecedented operational reach. Iranian forces have also deployed a variety of systems, including the KBAR Shakan, the Amhad with enhanced guidance, the long-range Kadar, and the Hajj Kasim, which has a reported range of 1,400 km. Another notable weapon is the Sil, nicknamed the 'dancing missile' for its ability to change direction mid-flight, making it difficult to intercept.

Broader Strategic Signaling

Amid the ongoing conflict, the US conducted a test of a Minuteman III intercontinental ballistic missile (ICBM). While this weapon is not being used against Iran, the timing of the test is widely interpreted as a strategic signal to other global powers, including Russia and China. The test serves as a potent reminder of the full spectrum of American military capabilities and its commitment to strategic deterrence, even while engaged in a major regional war.

Conclusion: A Modern War of Munitions

The conflict with Iran has provided a stark illustration of the realities of 21st-century warfare, defined by the extensive use of high-tech, precision-guided munitions. The massive deployment of the JASSM-ER and the combat debut of the PrSM highlight US technological superiority. However, the rapid depletion of these expensive and hard-to-replace weapons also reveals a critical logistical challenge. The primary takeaway for the Pentagon and its allies is the urgent need to expand and accelerate munitions production to sustain high-intensity operations and maintain credible deterrence globally.