Due to my love of guns, I joined the Army many years ago to learn gun smithing and I did attend their small arms repair school at the small arms repair school at Aberdeen Proving Grounds, MD, so, I did get my assured wish.
After being discharged (yes, an honorable discharge) I still wanted to have a little gun shop or at least get into civilian gun smithing and that was before all the 1968 bull shit new gun restrictions and laws. Easily saw that it just wouldn't be worth the time and expense to go to a civilian trade school for this profession so gave up on that idea. Now with the questionable future of firearms ownership, I for one sure wouldn't risk that profession NOW unless it would just be for a hobby type thing. Just my thoughts of course.