Anduril has become the poster child for a faster, software-speed kind of defence contractor. Last Friday, one of its rocket motors blew up on a test stand in Mississippi. The blast is a small setback that carries an outsized message about how hard building missiles really is.
A solid rocket motor exploded during a test fire at Anduril’s factory in McHenry, Mississippi, the company confirmed. It did so only after WIRED, which first reported the incident, asked about it. No one was hurt. The safety systems worked as designed, and most of the damage was to the test stand itself.
Chief operating officer Matt Grimm chose candour. In a post on X with photos of charred equipment, he framed the blast as routine. Every test failure, he argued, yields data that makes the next design stronger. Anduril would be “back to test firing rockets within weeks,” he wrote, and the production facility “remains on schedule.”
A rare bang
Not everyone calls it routine. Three people familiar with the work told WIRED they could not recall another test ending in an explosion in recent years. None knew the cause, an uncertainty that echoes Blue Origin’s New Glenn failure. The blast also halted a step that makes money for Anduril’s rocket unit. Rebuilding the rig could take up to two months, one source said, longer than the weeks Grimm promised.
That revenue matters. Before it can mass-produce motors, Anduril earns cash by building and testing prototype motors for customers such as the US Navy. That work brought in tens of millions of dollars last year, one person said. With the test stand down, some of it is now on hold.
The schedule dispute
Grimm said the plant is on track. WIRED’s sources disagree. Anduril had planned to start mass-producing rocket motors on 1 July 2025. A year on, four people said, it has not. The company entered the business in 2023 by buying a startup called Adranos, which built the McHenry site. That site has a rocky history, including a 2021 fire that melted an aluminium wall.
Anduril has heard this before, and it pushes back hard. After a WIRED investigation in March detailed safety and equipment problems, founder Palmer Luckey dismissed some of it as “whining about … inane stuff.” Chairman Trae Stephens said the firm was “scaling faster than anyone in this industry” and “fixing problems as we find them.”
Why a test-stand fire matters
The stakes are national. Solid rocket motors are the propulsion inside most missiles, and US production sits with just a couple of firms. That bottleneck has left the Pentagon short of munitions, so it is bankrolling startups like Anduril to fix it. One explosion does not change that math. But it is a reminder that move-fast slogans meet hard physics at the test stand.
Anduril, last valued at $61bn and backed by the likes of Founders Fund, can absorb the hit. The open question is whether the ethos that suits drones and cruise missiles translates to propellant chemistry, where mistakes come as fireballs. The same wager is playing out in Europe, where Stark Defence and its rivals are racing to arm the continent. For all of them, Grimm’s sign-off fits: onwards.
