OP, you're making the mistake of thinking that you have to stay within the same industry / job. You don't. Not even close. And, tbh, very few people these days will do that for their whole career anyway.
The keywords you're looking for are flexibility and capability.
After even a little time in the forces you'll have those characteristics in spades and can do pretty much anything.
Case in point, after even my very brief time in the RAF I spent a few years working across 3 continents as a ski instructor before returning to the UK to work in communications for a national supermarket.
Do yourself a favour, keep your options open. It's far more fun.