Generally, your school nominates people to attend through the local American Legion. My school does not, but I was able to get some names from my guidance counselor to talk to, and i found out why people weren't nominated at my school (there wasn't enough interest 11 years ago, so they stopped doing it), and that i could most likely get a sponsorship anyways once applications starts, which is apparently in february. i'm not sure what the situation is like where you live, but my best advice would be to talk to you r guidance counselor.