When you register with the selective service, you will not be automatically required to go to the military. Only during a crisis requiring draft, you could be called. Nonetheless it will be a lottery process and after being selected, they will conduct a mental, physical and moral fitness evaluation to determine if you should be deferred or exempted from the Armed Forces.
Not only U.S. citizens and permanent residents need to register, but also undocumented individuals, asylum applicants, refugees and DACA recipients who plan to become a U.S. citizen one day. Failing to register may cause you not to obtain certain federal benefits, such as federal student loans and grants, and U.S. citizenship.
Furthermore, according to the selective service website, “Men who fail to register may also be unable to demonstrate “good moral character” for purposes of the DREAM Act, so failure to register may bar them from DREAM Act benefits if the DREAM passes and has a “good moral character” requirement in it. Men who fail to register with the Selective Service may also be affected if an immigration reform bill requires men to register in order to adjust their status to that of a lawful permanent resident. “
For more information and to register online please visit http://www.sss.gov/default.html