If getting a vasectomy, asking to save a sample of your semen isn't any extra?

Hey there, I was thinking about getting fixed for my 20th birthday before I leave for the military. I don't have insurance at the moment and will most likely be paying all this out the pocket. I've heard around that it might cost somewhere in the $500-600 range. Having them save a sample of your semen just in case you change your mind in the future wouldn't add to the bill right?