In June 1925, Reza Shah introduced conscription law at National Consultative Majlis. At that time every male person who had reached 21 years old must serve for military for two years. The conscription exempted women from military service after 1979 revolution. Iranian constitution obliges all men of 18 years old and higher to serve in military or police bases. They cannot leave the country or be employed without completion of the service period. The period varies from 18 to 24 months.