Men were chosen by the draft. You had to sign up and if your number was picked - you left for Vietnam
The only way to get out of the draft was to have a medical deferment, move to Canada or stay in college.
Donald trump had 5 medical deferments for bad feet
War
War times make people very patriotic or nationalistic.
To get to better land to farm I think! I hope this helps!
Colonial landowners is the answer
