How to become a Soldier?

Soldiers have to face many obstacles before they're thrown into the force. They're put to the test mentally and physically. They're giving the choice to be "full time active soldier or be in the Army Reserves." Then a recruiter is sent to pick them up. If the soldier decides to back down the last minute. They're told they cannot back down and threatened to be thrown in prison. But, for those who are aware and smart enough to know better they should know it isn't true. No where in the books does it say they can be arrested for changing their minds the last minute.