Congratulations and welcome to the addiction of flying RC. Minnflyer is correct when he says you might as well suck your brains out with a vacuum cleaner and empty your wallet at the Local Hobby Store. I was a sea cadet when I lived in england and served with the sea cadets for many years (12 years old - 17 years) As soon as I turned 17 I joined the british royal navy and served with them for 4 years. when I left the navy I joined the army and served another 10 years. You will love the sea cadets apart from it being fun you will learn all sorts of valuble skills that will make your basic military training so much easier.
have fun it is great to see someone so you with a desire to want to serve in the military. good luck