American military service system refers to the wartime conscription system and peacetime conscription system, which have been implemented in the United States for a long time. 1940 to 1972 implements the selective conscription system. That is to say, all men in the United States, except active servicemen, diplomats in the United States and foreigners, must register with the local conscription Committee within five days after 18' s birthday and fill out the "Classification Adjustment Form". Then classify and number, and draw lots to select people who meet the service conditions. ?
1973 the conscription system was abolished and changed to conscription system. Recruitment targets are mainly young men and women of 17-2 1, and are recruited once a month by recruitment stations set up by various services and arms throughout the country. Those who are recruited will sign contracts with the military. After the expiration, those who need to be retained can renew their contracts. Applicants are free to choose the place of service, the army (soldiers) and specific units.