We didn't have conscription in WW1, but we did in WW2 and then "National Service" in the 50s. In the 60s there was a draft that had a "ball draw" every month with the date (a ball numbered from 1-28/30/31) and if you turned 18 on that date of the month, you were drafted.

There were exemptions but it still seems a cruel form of gambling in a way.