Guys, give the kid a break. I was like that when I joined up, some of my rear-crew would argue that I still am. I am a little jealous that he can afford his own PPL(H) but we will gloss over that.
Although the tone of his enthusiasm is obviously going to rub the old and bold up the wrong we still, despite the best efforts of many governments, have a very effective training system which will hopefully contain and direct his energies in the right direction.
That being said, the points about the Army Aviation world are true from my point of view, the Lynx is dead, long live another Lynx; the RN don't get the chance to do anything really interesting not withstanding the boys in BAS so join the Air Force I say but then I am biased where by the time he is through training he will be ready for the invasion of Iran and may see more excitement than he hoped for. You have got to really want it though.
Good Luck.