Hey I am 27 years old have worked in the plumbing industry since I left school. However I have become interested in joining the navy as a ET marine engineer. As I would like to widen my skills. I believe this job is the one that will use my skills picked up in the plumbing industry the most out of any job in the navy. Is this correct? I would be taking quite a big pay cut to join, but can promotion be quick in this trade?