I've always wanted to.....

I've always wanted to be in the military. I can't though, and it's ok, cause i wouldn't trade giving my kidney to my dad for anything in the world. But i don't understand why having 1 kidney should hold me back. If i'm gladly willing to go to the front lines and die for my country, what does it matter if I only have one kidney. That one kidney works just as well as both of most people's. I just wish I could join.