Anduril has unveiled Steelfin, a surface-to-air interceptor missile that the company describes as modular and reconfigurable, and that its executives are pitching at roughly one third of the cost of the Patriot system's current PAC-3 Missile Segment Enhancement. Anduril's own announcement frames the goal as cost, volume and capability overmatch against ballistic, cruise and hypersonic threats. The company says it has been developing the weapon for a couple of years, on the bet that buyers would soon want interceptors that can be fielded in far larger numbers than today's exquisite rounds.
The design idea is modularity. According to Anduril president and chief strategy officer Chris Brose, Steelfin can fly with different rocket motors and different seekers, and can be launched from several platforms, ranging from Patriot and the Army's Common Autonomous Multi-domain Launcher to the Typhoon system and containerized munition canisters. The same airframe can be reconfigured toward cheap targets such as Shahed-class one-way attack drones, or toward harder targets such as ballistic and cruise missiles and hypersonic weapons. Brose framed the problem as volume: allied militaries are relying on legacy interceptors that do not scale to the number of threats now being launched at them.
Steve Milano, Anduril's senior director of missiles, said the company is competing for the Army's low-cost interceptor effort, having been selected to continue testing and demonstrations after the service's xTech Apex Intercept competition. He also called Steelfin a natural fit for the Army's newly reported Future Interceptor program, which seeks a next-generation replacement for PAC-3 MSE with a seven-to-ten-inch terminal stage and a ten-to-thirteen-inch booster sized for existing Patriot and Common Autonomous Multi-domain Launcher cells. Breaking Defense reported days earlier that Lockheed Martin and one undisclosed company were selected for that program; Anduril declined to say whether it is the second company.
On industrial scale, Milano said Anduril expects full-rate production at the end of 2028 or the beginning of 2029. The low-end target is multiple thousands of interceptors per year, and the high end is closer to hundreds of thousands per year, depending on United States and foreign demand. Most subassemblies would be built at the Arsenal-1 facility in Ohio, with final integration split across a handful of partners. Solid rocket motors would come partly from Anduril's in-house line and partly from outside suppliers, through a modular motor mount designed to take on new providers.
The announcement lands at the start of the Association of the United States Army's annual meeting, alongside Lockheed's own next-generation PAC-3 Edge reveal. The caveats are the usual ones for a debut: cost and production figures are company targets, there is no published flight-test record, and the volume range spans two orders of magnitude, which says more about uncertainty in demand than about a committed plan.
- Breaking Defense placed Steelfin against the Army's Future Interceptor competition, where Lockheed and an undisclosed second vendor were reportedly picked, and Lockheed's same-week PAC-3 Edge reveal.
- Anduril's own release framed the weapon around cost, volume and capability overmatch across ballistic, cruise and hypersonic threats, without published performance data.