When people talk about a “fragile defense industrial base,” it can sound abstract. Then you look at something tangible—like forging plants—and it gets very real, very fast. Over the last 20 years, 241 U.S. forging plants closed, leaving only 152 active by 2024, a near 60% contraction in heavy industrial capacity nationaldefensemagazine. That’s not just fewer factories. It’s fewer places to make gun barrels, ship shafts, and armor plate. It’s also fewer suppliers to absorb shocks.

A bipartisan commission in 2024 concluded that decades of manufacturing erosion left the defense base “unable to meet the equipment, technology and munitions needs” of the U.S. and allies.

Ukraine made the constraints visible. The U.S. produced about 14,000–14,400 155mm shells per month before 2022 defensenews. A modern high-intensity war can burn through that in days. By late 2024, output hit 40,000+ per month, and the target is 80,000–100,000 per month by 2025, backed by billions in new investment. That’s real progress, but it also shows how deep the hole was.

It’s not just shells. The U.S. sent 7,000+ Javelins to Ukraine in 2022—roughly a third of the stockpile—and is trying to double annual production from ~2,100 to 4,000, a process that will take years defensenews. The Stinger missile was out of production for decades; in 2022, Raytheon said it couldn’t resume deliveries for at least a year because parts had gone obsolete. Meanwhile, Indo-Pacific Command warned in late 2023 that support for Ukraine and Israel was “eating into” U.S. inventories militarytimes.

The more the industry consolidated, the more it created brittle choke points. Only one U.S. company produces ammonium perchlorate, essential for solid rocket motors. The U.S. has a single plant for high-volume shell filling, built in 1940 leisureguy.

Modern weapons are a microelectronics story. A single Javelin contains about 250 microchips. Yet over 90% of advanced semiconductors are made abroad, mostly in Taiwan. The U.S. designs the brains, but relies on overseas fabs to manufacture them.

Then there’s rare earths. China refines roughly 85–90% of global rare earths, a chokehold on the metals used in guidance systems, motors, and radars rareearthexchanges. The U.S. has deposits, but lacks end-to-end processing.

If you want the starkest indicator of industrial asymmetry, it’s shipbuilding. Chinese shipyards have an estimated 232× greater capacity by tonnage than U.S. yards yahoo. In practice, that means China can build ships—commercial or military—at a pace the U.S. simply can’t match. U.S. officials have warned that a weak industrial base “could invite aggression” navytimes.

There’s movement. The Pentagon is investing in shell production, expanding forging capacity, and using the Defense Production Act to shore up fragile inputs. But the hard truth is that rebuilding a supply chain takes years. Training skilled welders and machinists takes years. Building fabs and chemical plants takes years.

If they fail, everything downstream fails with them. The uncomfortable lesson of 2022–2024 was that capacity is strategy. And right now, capacity is the scarcest strategic asset we have.