In reply to oceannash909:
Not entirely related, but try to do the civilian mountain leader training course before you go. It'll seem irrelevant for the first 12 months, as it's all military bull$hit and not quite the leadership style they desire etc.. but it's a good start skills wise and you can jump up the ladder quicker once in. As it's job related you'll get priority 1 on all joint service mountaineering courses, as well as access to all the usual marine in house training. There have been a few dual hatted marines with civvy and mil mountain instructor tickets, but not many. Good admin, being organised, when you're tired, it's cold etc.. is a skill in itself that's as beneficial as fitness.
Top tip, get your feet sorted and don't do all your pre training in military style boots, or run with silly heavy bags. Have your feet scanned and get good inner soles(several pairs). If you think you're fit enough to run with weight just go up steeper hills faster, steady downhill, play the long game, you'll need those knees still after you're 40.
Post edited at 21:18