Pretty much everything with a potential dual use is classified as munitions, the U.S. Munitions List is quite long and explicit - https://www.ecfr.gov/cgi-bin/text-idx?SID=86008bdffd1fb2e79c...

A good example is shock absorbers designed for vehicles heavier than 30 tons. It has all kinds of civilian uses in heavy machinery, but since that's a key tech for armored vehicles, they are also on the munitions list. The same applies for rocket and jet engines above certain parameters, all kinds of space imaging technology, etc, etc.