In 1981, the Supreme Court upheld the constitutionality of requiring only men, and not women, to register with the Selective Service ( rostker v. goldberg, 453 . 57, 101 S. Ct. 2646, 69 L. Ed. 2d 478). The United States has never conscripted women into military service, nor has it ever instituted universal military service. It has conscripted only individuals meeting certain age, mental, and physical standards. Congress has allowed the deferral of conscription for certain individuals, including those who need to support dependents or are pursuing an education. Among those who have been declared exempt from service are sole surviving sons, conscientious objectors to war, and ministers of religion.