Here in the States with his parents permission he's man enough to enlist in. If the same sort of thing is part of your law it might give him a real lesson and the appropriate discipline (courtesy of the Regimental Sergeant Major of course) to finish growing up and take out some of the dents in personality he's acquired.
He's old enough to enlist here as well, but the ADF rarely takes anyone that age anymore and frankly having spent some of my career dealing with junior recruits, I'm glad they don't (although I wasn't quite 16 when I joined the RAN, so I'm being a bit of a hypocrite). If he wants to serve when he's older, that'd be great - but I doubt he's ready yet.