<p>I don't know much about this, but some schools do have family housing. It's usually for older students, but I do recall that at least one school allowed students in your situation to live in family housing, in the same way it does for single parents. Ask at each of the schools you are considering. </p>
<p>I think it's going to be a lot harder for a young single male to get legal custody of a 14 year old female than you think it will be. It will take a LONG time, with things like home visits and court dates, etc. The military is not going to let you just "declare" that your sister is your dependent and allow her to live with you in base housing and/or off base in private housing. You're going to be expected to live in a barracks for quite some time--and there's not going to be a place there for your sister. </p>
<p>I'd call your local Bar Association --an organization of attorneys-- and ask for someone who might give you a free or low cost consultation. Also call Legal Aid. At least find out what you have to do to get custody. </p>
<p>If you're at all religious, contact Catholic Charities, The Federation of Protestant Welfare Organizations, the Salvation Army or any other group you feel comfortable with. Explain the situation and ask for help figuring out what to do. I'd also contact the chaplain of your faith at each of the schools you are considering. Get in touch with organizations like Boys & Girls Club. </p>
<p>Good luck! Keep us posted.</p>