How did the draft process work during the Vietnam war?
All able bodied (healthy) US males had to register for the draft (conscription). Registration was required before the Vietnam War.
Once a man reported, he was examined by military medical personnel, mentally tested (written test), and then put on a chartered bus to the nearest US Army Fort to commence Basic Combat Infantryman Training, nicknamed boot camp. His obligation to the United States government was two years of active duty and four years of reserve. Today, it's an eight-year obligation, if needed, via registration.