The United States is set to commit almost its entire inventory of long-range JASSM-ER cruise missiles to its ongoing military campaign against Iran, significantly reducing stockpiles earmarked for other regions, according to a Bloomberg report.Citing a person with direct knowledge of the matter, Bloomberg reported that orders were issued in late March to pull $1.5 million worth of missiles from the Pacific stockpile, with additional weapons from the continental US and other locations redirected to US Central Command bases and Fairford in the United Kingdom.After redeployment, only about 425 JASSM-ER missiles will remain from the pre-war inventory of about 2,300, the report said. About 75 others are considered “unusable” due to damage or technical failure. The remaining operational stock would be enough for about 17 B-1B bomber missions.The JASSM-ER, or Joint Air-to-Surface Missile, has an extended range of more than 600 miles and is designed to attack targets from a distance while avoiding enemy air defenses. With the shorter-range JASSM, which has a strike range of about 250 miles, about two-thirds of the US stockpile is now allocated to the Iran conflict.The heavy use of long-range precision weapons comes as US and Israeli forces continue their air campaign that began on February 28. According to reports, more than 1,000 JASSM-ER missiles were expended in the first four weeks of the war alone.Although such weapons reduce the risk to personnel by enabling stand-off attacks, their rapid consumption is putting a strain on reserves designed for potential conflict with more advanced adversaries such as China. At current production rates it may take several years to replenish these stocks.Although Washington and its allies claim to have knocked out a large portion of Iran’s air defense network, recent losses indicate continued risks. An American F-15E fighter plane was shot down on Friday, followed by an A-10 fighter plane and two combat search and rescue helicopters were damaged, according to the New York Times. Iran has also reportedly destroyed more than a dozen MQ-9 drones during the conflict.Despite the scale of deployment, not all committed missiles are expected to be used. So far, JASSM-ERs have been launched from B-52 and B-1B bombers as well as strike fighters.The US has funded the purchase of more than 6,200 JASSM missiles since 2009, although production of the baseline version ended nearly a decade earlier. Manufacturer Lockheed Martin is expected to produce 396 JASSM-ER missiles in 2026, with the potential to increase to 860 annually if production lines are fully dedicated.US Central Command and the Defense Department did not immediately respond to requests for comment.Warning of the ‘Stone Age’ and the dynamics of the evolving battlefieldUncertainty remains over the next phase of the US campaign, even as additional ground forces, including Marines and paratroopers, have been deployed to the region. Speculation has intensified about a possible move to seize Kharg Island, an important hub for Iran’s oil exports.President Donald Trump said in a Wednesday night address that “over the next two to three weeks, we will bring them back to the Stone Age where they belong,” without clarifying whether the comments referred to Iran’s military, government or civilian infrastructure.American military officials have indicated a change in strategy. Gen. Dan Kane, Chairman of the Joint Chiefs, said B-52 bombers have begun flying over Iran, suggesting better access to airspace and enabling the use of cheaper JDAM precision-guided bombs.However, analysts have so far questioned the reliance on stand-off weapons. “It raises questions about the extent to which the United States continues to rely on interdiction capabilities,” said Kelly Grieco, a senior fellow at the Stimson Center, referring to the delay in deployment of older B-52 bombers.The conflict has also put pressure on missile defense systems. According to Gulf officials, Iran has launched more than 1,600 ballistic missiles and about 4,000 Martyr-type cruise missiles across the region. At least 3,200 interceptor missiles may be required to intercept ballistic threats alone.Production constraints remain a matter of concern. Lockheed Martin currently manufactures about 650 Patriot PAC-3 interceptors annually, with plans to increase to 2,000 per year by 2030. THAAD interceptor output is 96 per year, with an agreement to increase production to 400.Meanwhile, the US fired hundreds of Tomahawk cruise missiles during the campaign. Before the war, the US inventory consisted of approximately 4,000 Tomahawks, including older and anti-ship versions. RTX Corp plans to produce about 100 new missiles in 2025, while upgrading about 240 older units to the latest Block V configuration.