I hope that guy who taught welding in the Army didn't learn from my old band director in high school.
This band director was a "ground pounder" who watched the bulletin board in his company area very carefully. There was a notice there that a welding instructor was needed. He signed up and told them he was a welding instructor. He got the job, and went to the shop every night to read the lesson and practice it for the next day.
I did the same thing in my Army Reserve unit back in '61. They needed a cook, I said, "I can cook". I couldn't of course, but I could read. It worked for me.