If its an ongoing issue I would imagine it would exclude you, and yes you should disclose it. Imagine going through basic training and putting your back out, then they find out and you'll never get another chance because you were dishonest.
I had a hernia removed when I was 2 and it wasn't an issue, but I'm not sure what criteria was used in that decision. I would imagine if you can get it fixed and you can have a specialist give you the all clear then it shouldn't be too much of an issue, but only an AVMed doctor could tell you exactly the variables and likelihoods are.
Last edited by Very Sneaky; 4th Jul 2013 at 15:48.