context: In 1971, the Military Selective Service Act was further amended to make registration compulsory; all men had to register within a period 30 days before and 29 days after their 18th birthdays.
source: Student deferments were ended, except for divinity students, who received a 2-D Selective Service classification.
reference_original: Se terminaron las prórrogas a los estudiantes, excepto para los seminaristas, que recibieron una clasificación 2-D en el sistema de servicio selectivo.
reference_flipped: Se terminaron las prórrogas a las estudiantes, excepto para las seminaristas, que recibieron una clasificación 2-D en el sistema de servicio selectivo.