...none of them!!!
...that has to be the answer to your original question.
After 27 years service (still ongoing I might add), I certainly wouldn't want my kids joining up, and they are about your age.
A lack of opportunity in civvy street is no motivation for a career in the military. You have to really want to be treated like dirt, work like a slave, get trodden on by bosses chasing promotion etc. etc.
And that's before the Talitubbies or Mahdi army try and kill you daily, and you get to experience the things which are too horrendous to make the News at 10...
Of course, if you want all that go for it but otherwise...
Best of luck with your application.
CS