Most people who enlist join through the Delayed Entry Program(DEP) sometimes called the Future Soldiers Program. This allows someone to sign up for the military prior to the date when they will ship out for initial training. People in the DEP are unpaid and are not subject to the Uniform Code of Military Justice, UCMJ.
After Joining the DEP, Some People change their Minds. During the delay before leaving for basic training some people feel they were pressured into something they weren’t sure about. Others have life changes—perhaps they decide to go to college, get married, or they get their dream job. They no longer wish to be locked into years of military service. Because the DEP is the easiest phase to get out of the military, it a critical time for anyone having second thoughts to give serious consideration to whether they truly belong in the military.