Good idea Jonno. A good buggering and made to march for 15 miles a day through rain and sleet should toughen them up. Or break their spirit and turn them into argumentative, high-pitched gibbering wrecks.
Seriously though I would recommend it to any young man, they can learn a trade (or several) , meet new people and get some discipline instilled in them. If they don't like it or can't hack it, then they can leave as long as they are not yet 18.