There are a lot of non-union trades as well.
Machinists are sorely needed. I worked in machine shops my entire adult life. I operated mostly grinders in tool and die shops. It was a living. While I didn’t make union wages, I didn’t have to put up with union bs, either.
ONE TIME, I was actually a Teamster for a little over a year. I was part time at UPS working a second job, loading airplane containers, or “cans” as they called them. And that was during the big UPS strike in the ‘90s.
I was in my 40s, and realized working full time and doing the UPS thing was too much. The part time job I had at Radio Shack a few years earlier was a LOT less strenuous.
They are NOT learning enough MATH skills today to be a machinist.