I'll be up front with you, we've a run of 15/ 16 year olds, or some claiming to be, who... to be blunt were assholes.
So, not a ding on you, just be aware that the Under 18 Crowd is under a microscope right now. Search, search early, search often, read, read, read, and then decide to post. Maybe.
16? You're going to be a junior in high school this year? Piece of advice: unless you have some weight issues I wouldn't even worry about this Ranger stuff for another year....or anything military for that matter. But, if your heart is dead-set on being Ranger-rific, then learn to work out intelligently to avoid injuries later. DO NOT EVEN THINK about carrying a ruck right now and don't even bother to ask.
Again, welcome aboard. Be a kid, it's your only time to be one.