It says on the fine print, even if you are undocumented you STILL have to sign up for it. Why ? so they can find you in case there's a draft and because even though you may be undocumented, the powers that be still have a want and need to keep a tab ON EVERYONE.I finally sent mine out earlier this week for two reasons, because I was at the post office and because I finally know better and understand. I understand that you have to do things even though you may not want to, but sooner or later you will have to do them. If a male doesn't register before 26, they'll risk the ability to apply for citizenship, jobs, financial aid and things like that. Of course we all know why this is so but none the less, somethings have to be done. You have to go through motions and realize that everyone is equal. It may be for something most people appose, war, but you still have to do it none the less.