"It isn't the function of the government to keep the citizen from falling into error. It's the function of the citizen to keep the government from falling into error." R.H. Parker
If you are 17, you're parent(s) would have to sign for you. That's what mine did.
It helps to prepare you if you use it. If you don't attend the meetings, don't listen to your Recruiters about physical fitness, etc. then it won't.
You need to be doing PT on your own anyway.
A veteran - whether active duty, retired, National Guard or Reserve - is someone who, at one point in his or her life, wrote a blank check made payable to "The United States of America" for an amount of "up to and including my life." That is honor, and there are way too many people in this country who no longer understand that - Author unknown.