hmmm... what do i do?

Realisticly 6 months is not THAT long. Not telling her would only keep you in agony. You should tell her before you go. Talk about it, and see what she wants to do. If she will start now, or give it some thought until you come back. You should not keep it a secret. Secrets crowd the mind. She does seem to like you, and care about you deeply. Tell her!!!!

You may be going to boot camp, but that shouldn't stop you. You need to tell her how you feel or you could miss out on a chance to be with her. If you love her, tell her. If she cares about you as much as you care about her, she'll wait. Just tell her.

I agree with sunflower on all of her points. Tell her.