law: Chapter III
  Registration and Enlistment for National Service
  11. Persons required to register.-
  (1) Every qualified person shall, if he is liable, at the commencement of this Act, to be called up for national service, make an application, within ninety days from such commencement, to be registered under this Act.
  (2) Every qualified person who becomes liable after the commencement of this Act, to be called up for national service, shall, within thirty days from the date on which he becomes so liable, make an application to be registered under this Act.