...when your 18? and if you don't you go to jail?Is this real(my mom says no)?I don't want to go to jail for 5 years,but I don't want to accidently join the army either.
At eighteen, you are required, by law, to sign up for the selective service, if you are a male.
The selective service is like a military census bureau, and hasn't been used since the war in Vietnam, 40 years ago. It is there in a national emergency, in the event the US had to call its citizens to war.