There are no general exemptions for the conscription. The law requires employers, landlords etc. to continue any pre-existing contracts after the service. For medical reasons, exemption or postponing is given by the military authority after an examination by a military or military-appointed doctor. If the disability is expected to be cured, the exemption is temporary, and the service is postponed. If the disability continues until the male turns 25, he is exempted. The basic doctrine is that the great majority of each age cohort serve, and the size of the active army can be adjusted by changing the maximum age of reservists to be called up, instead of using selective service.