The Pentagon plans to invest more than $20 billion in munitions in its next budget. But whether the industrial base will be there to support such massive buys in the future is up in the air — at a time when America is expending munitions at increasingly intense rates.

The annual Industrial Capabilities report, put out by the Pentagon’s Office of Manufacturing and Industrial Base Policy, has concluded that the industrial base of the munitions sector is particularly strained, something the report blames on the start-and-stop nature of munitions procurement over the last 20 years, as well as the lack of new designs being internally developed.

Some suppliers have dropped out entirely, leaving no option for replacing vital materials. Other key suppliers are foreign-owned, with no indigenous capability to produce vital parts and materials ― setting up the risk that a conflict with China could rely on Chinese-made parts.