I've tried making an account on E-Goat but can't get past the registration. The site uses the reCaptcha V1 which I think is now expired. Can't make an account
Driver - mostly civvy in RAF too with mil doing the overseas stuff (not sure how that will fit with your dodgy knee.)
HR - decent choice, get some decent quals and same pay as techies!
Survival Equipment Fitter - someones got to do it.