 At that time it was required that all males, born on or after January 1, 1960, register with the Selective Service System.Those who were now in this category were male U.S. citizens and male immigrant non-citizens between the ages of 18 and 25; they were required to register within 30 days of their 18th birthday even if they were not actually eligible to join the military.The Selective Service System, still in essentials what it was in 1980, describes its mission as "to serve the emergency manpower needs of the Military by conscripting untrained manpower, or personnel with professional health care skills, if directed by Congress and the President in a national crisis".