You can't join the Army until you're 16. Whilst a bit of boot camp might sort these lads out from there on in, it won't have stopped them being a bunch of little scrotes causing all sorts of misery up to their 16th birthday. Even the threat of one day doing national service isn't going to stop them from being little scrotes. It's a bit like shutting the door after the horse has bolted, the damage is already done.
Another point being that why is it the Armed Forces' responsibility to sort out the failings of inadequate parenting and a general decay in society?
The Armed Forces already have budgets which fail to meet their expenditure (although a lot could be saved by getting rid of some of the wasters in the procurement departments) so taking on every boy and girl from say 17-19 isn't going to happen.
One of the great thing about our Armed Forces is that they're entirely made up of volunteers unlike many other European nations. They are people who want to be there, doing their bit because they want to, not because somebody told them to.
Now I won't even pretend to have all of the answers, or even any of them. All I have is an opinion. Now I don't think we live in a broken society but I do think we live in a damaged one and there needs to be a lot of work done to try and restore some of it. The biggest problem I think we face here is that there are large swathes of society who don't want to do anything about it, they want someone else to do it for them.
I think the moral compass is royally screwed up for a lot of people, they're lives are blighted but low moral values through gutter journalism, "celebrity" obsession and ***** like Jeremy Kyle and Trisha (and that's just the tip of the iceberg, I could rant on for hours

). Whilst freedom of speech is fine, the freedom of the internet on people (children) too inexperienced through education and life experience to separate good from bad, right from wrong, acceptable, normal behaviour from that which is unacceptable is a bad thing. I think the internet is great, but not all of it is great for children and too many have unfettered access through a combination of indifferent parenting and the fact that the children probably know more about computers than the parents so any attempts to control their access is bypassed.
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Now I'd best write a caveat before I get jumped on that, yes I know it isn't all children that are bad and yes I know not all parents are bad, but truth is, there are plenty of examples of both. Just because you can reproduce doesn't mean you should in my opinion.
Essentially what I'm saying is that by the time national service is a factor it's pretty much too late. The children/youths/young adults you read about in stories like this need setting on the right path long before it gets to this stage and for that they need good parenting, good education, good guidance from other's in society, good examples to look up to and discipline, lots of it.