Take a look at
this.
I'm not sure about going to jail if you don't sign up, but last I heard, you are required to fill out a draft card in the United States.
e: According to leel:
11:21 <&eleeleth> it is a criminal act to not sign up for selective service and you can go to jail for it
So, that's probably correct.
Last edited by box; Jun 21, 2013 at 06:23 PM.