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Defense & Space · 2026-06-14

America's Missile Shield and Its Moon Rocket Share the Same Two Factories. A New Report Says They're Running Out of Capacity.

The United States has 44 interceptors designed to shoot down a nuclear warhead mid-flight — somewhere above the atmosphere, above most of the planet. Forty-four. For the whole continent.

Now a new government report says the factories that build the rocket motors inside those interceptors — the same factories that build boosters for America's Moon rocket, and motors for HIMARS systems firing in active conflict zones — are running into a wall.

The wall has a name: the solid rocket motor bottleneck. And it's been building quietly for thirty years.

The Engine Inside Everything

Solid rocket motors don't look dramatic. They're essentially a metal tube packed with a rubber-like propellant compound that burns fast and brutally hot. No turbopumps. No moving parts. Once you light them, they go until they're empty.

They're inside almost everything that needs to go up fast: missile defense interceptors, hypersonic test vehicles, ATACMS battlefield rockets, Navy SM-3s — and the twin Space Launch System boosters that strap onto NASA's Artemis rocket and throw 8.8 million pounds of thrust at the Florida sky.

In the United States, only two companies build the large strategic ones. Northrop Grumman, whose Promontory, Utah facility sprawls across a high desert like a small city. And Aerojet Rocketdyne, now folded under L3Harris after a failed 2022 merger attempt with Northrop.

2Major US solid rocket motor manufacturers

44US ground-based missile interceptors in service

2027Year the demand crunch peaks, per CSIS

Two manufacturers. Every interceptor. Every Moon launch. Every rocket that needs to go up fast and burn hard.

Key takeaway: Solid rocket motor production lines take years — sometimes a decade — to scale up. Once a factory downsizes, rebuilding capacity isn't a quarterly project. It's a generational one.

How We Ended Up Here

The 1990s were a reckoning for the US defense industry. The Cold War ended. Budgets collapsed. Pentagon planners pushed contractors to consolidate and become 'efficient.' Companies that had once competed — Thiokol, Hercules, Atlantic Research, United Technologies Chemical Systems — were absorbed, folded, or shut down entirely.

Six or seven solid rocket motor manufacturers became two.

For a while, this looked like smart management. Demand was predictable. Factories ran lean. Nobody was stockpiling capacity they didn't immediately need.

Then Ukraine happened. Then China's ballistic missile inventory grew by thousands of warheads. Then the US started war-gaming scenarios where a peer adversary actually launches.

~30 years

Of industrial consolidation — shrinking a six-manufacturer industry down to two

Now the Pentagon wants significantly more interceptors by 2027. The Center for Strategic and International Studies released a report on June 14, 2026, making the production math explicit: planned interceptor buys will test a supply chain that never fully recovered from decades of consolidation.

The Single Point of Failure Nobody Talks About

Here's where it gets genuinely unsettling.

Most solid rocket motors run on ammonium perchlorate — the oxidizer that makes the propellant combust. In the United States, that compound is produced at a single facility in Henderson, Nevada: American Pacific Corporation.

One plant. For the entire defense and civil space industrial base.

A fire there in 1988 nearly crippled the US space program. The facility was eventually rebuilt. The single-point-of-failure never was.

US facility producing the primary oxidizer inside most American solid rocket motors

Building new ammonium perchlorate capacity requires environmental permits, hazardous materials certifications, and specialized construction that takes five to ten years minimum. Even if Congress appropriated the money today, meaningful new supply couldn't come online before the 2027 crunch point. The bottleneck isn't just about factory floor space. It goes deeper — all the way to the chemistry.

Key takeaway: The supply chain for America's missile defense has a single address for its most critical chemical input. That's been true since before most people reading this were born.

The Space Angle You Didn't Expect

Most people picture missile defense and Moon launches as entirely separate worlds. They share a factory floor.

NASA's Space Launch System — the rocket carrying Artemis crews back toward the Moon — uses the largest solid rocket boosters ever flown operationally. Each one burns 1.5 million pounds of propellant in 126 seconds. Two per launch. Built by Northrop Grumman. Same Utah facility. Same propellant chemistry. Same oxidizer supply chain.

126 secSLS solid booster total burn time

1.5M lbsPropellant burned per booster

2 per flightBoosters consumed each Artemis mission

So when the DoD's demand for interceptor motors spikes — because Congress funded more Ground-Based Interceptors in Alaska, or the Navy needs SM-3 replenishment, or the Army is burning through ATACMS in a conflict — the factory building Artemis boosters absorbs that demand too. Every program competes for capacity. Nobody has a reserved lane.

It's one of those connections that sounds like a conspiracy theory until you look at the production contracts. How military and civil space share critical infrastructure is one of the most underreported stories in aerospace — and one of the most consequential.

For scale: A single SLS mission burns through as much solid propellant as roughly 300 ATACMS battlefield rockets. In a sustained conflict, that's a real competition for the same supply.

What the Pentagon Is — and Isn't — Saying

The Department of Defense has not been silent on this problem. The 2022 Industrial Base Assessment explicitly flagged solid rocket motors as a critical concern. The 2023 National Defense Industrial Strategy called for investment. DoD has signed multi-year procurement contracts for HIMARS rockets specifically to give manufacturers production certainty they can plan around.

Northrop Grumman has invested in expanding Promontory. Aerojet (now L3Harris) has sought government co-investment for capacity growth. The Defense Production Act Title III program exists specifically to fund industrial base gaps like this one.

To be fair: The CSIS report doesn't say the supply chain is broken beyond repair. It says the margin for error is dangerously thin — and that planned 2027 interceptor procurement volumes will stress a system still recovering from thirty years of consolidation. The government knows the problem exists. The question is whether the response arrives before the timeline runs out.

Why 2027 Is the Year to Watch

The Next Generation Interceptor — designed to eventually replace aging Ground-Based Interceptors in Alaska and California — will need motors. So will the expanded SM-3 inventory the Navy is pushing for. So will hypersonic glide vehicle test programs that are accelerating across all three services. And so will Artemis III, which needs those five-segment solid boosters to fly.

All of that demand converges around 2027.

GMDGround-Based Midcourse Defense — needs more motors

SM-3Sea-based interceptor — also competing for capacity

NGINext-Gen Interceptor entering production phase

The CSIS report's core recommendations: multi-year procurement contracts to give manufacturers planning certainty, direct investment in ammonium perchlorate production capacity, incentives for new market entrants, and better coordination across DoD programs to avoid simultaneous demand spikes that no factory can absorb.

Some of this is already in motion. 'Already in motion' and 'ready by 2027' are two very different timelines.

The uncomfortable reality is that thirty years of assuming a peaceful, efficient world created a defense industrial base optimized for exactly that world. The world changed. The factories haven't caught up yet.

Bottom line: The US has the most advanced missile defense architecture ever built. The interceptors work. The sensors work. The command networks work. The factory that makes the motors — there are two of them — is the quiet constraint that nobody put on a billboard. The CSIS report just did.

Curious what's in orbit watching for missile launches right now? The SkyLens live tracker shows early-warning satellites and military assets overhead in real time. Or read more about how space and defense infrastructure intersect in our latest stories.

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