Where are you located? Willing to travel?
I was in 421 many years ago but not to work locally...because there was none.
421 had one local for two states. I don't know if that has changed or not. It was called a suitcase local...if you stay busy it will be living out of your suitcase.
On a positive note, I work in Fort Bragg a lot and the union is very active there. A very large project has just started in Fort Bragg and the mechanical contractor is a union company from Calif. and will need to man the project. That will keep you busy for a couple of years if you can get on it. If you need contractor names I can get them for you. Outside of Fort Bragg I don't know if they have much work. Good luck with the test and keeping busy.