The United States' role as a primary global weapons supplier is facing significant strain, as increased demand from ongoing international conflicts and the need to replenish domestic stockpiles are causing delays in deliveries to allied nations. The U.S. has been the world's top arms exporter for years, with sales reaching nearly 100 countries over the past five years.
The conflict in Ukraine, which began in 2022, has been a significant factor in depleting U.S. defense inventories, particularly for critical assets like the Patriot Missile Defense System. While overall transfers to Ukraine represent a minor portion of shrinking U.S. stockpiles, the impact on specific systems is notable. Before Russia's full-scale invasion, the U.S. estimated its inventory of MIM-104 Patriot missiles to be around 2,200. Approximately 600 missiles were subsequently provided to Ukraine, with some possibly originating from U.S. allies. Despite new production outpacing these transfers, with an estimated 2,300 missiles in the U.S. inventory before the recent Iran conflict, an estimated 36% of Patriot Interceptors remain from the pre-Iran war inventory.
Mark Cancian, a retired U.S. Marine colonel and senior advisor at the Center for Strategic and International Studies (CSIS), noted that production lines for these munitions have been maximized. "We've maxed out the production lines now, and that process began during the Ukraine War when it was clear that modern conflict was going to require a lot more munitions than we had been planning on," Cancian said.
Rep. Michael McCaul, R-Texas, chairman of the House Foreign Affairs Committee, expressed concern over the delivery delays. "When we can't deliver on that promise because we can't make those weapons fast enough, it hurts our alliances, it hurts allies' ability to protect themselves," McCaul stated.
The U.S. is the sole manufacturer of the Patriot battery and one of two countries, along with Japan, that publicly produces Patriot missiles. Patriot producer Raytheon indicates that the system is the "foundation of integrated air and missile defense for 19 nations."
Similar delivery delays are anticipated for Tomahawk missiles. While the U.S. stockpile remains substantial, new orders from countries like Japan and the Netherlands may face pushbacks. "With Tomahawk, we have the same situation with the Japanese. They bought 400. They're told they're being pushed back in the queue," Cancian explained. He added that Japan is facing regional security challenges from China and has reconfigured naval assets to accommodate Tomahawks, highlighting the diplomatic implications of these delays.
Other systems, such as the THAAD (Terminal High Altitude Area Defense) system, have also seen significant depletion. The U.S. retains an estimated 52%-62% of its THAAD inventory, with outstanding deliveries to Saudi Arabia expected to conclude by April 2028. The Precision Strike Missile (PrSm) has experienced the most significant reduction, with only 10-22% of its pre-conflict levels remaining, according to CSIS estimates following expenditures and revised inventory figures.
Under Secretary of War for Acquisition and Sustainment Michael Duffey emphasized the need for a robust defense industrial base. "The world we live in is an increasing threat, and that means that we need a bigger military force, and we need a stronger defense industrial base to be able to equip the warfighter and supply all that we need to win the fight," Duffey said. This strategic imperative to bolster U.S. defenses directly impacts the availability of advanced weaponry for international partners.
