My answer to How do modern armies with conscription deal with recruits who don't want to be there?
Answer by Ken Larson:
When the U.S. had conscription in the form of a draft during the Vietnam era a draftee was placed into basic training and objective attempts were made to physically and mentally condition each trainee to be combat ready. He or she was then sent to advanced individual training that further enhanced preparedness in the form of a Military Occupation Specialty.
I was a basic training drill instructor during the above process for several months.
Along the way if a trainee exhibited attitude issues that effected performance they were disciplined, to include restrictions on free time, fines and similar administrative techniques. Physical force was not allowed. If a training went absent without leave (AWOL) they would in all cases be pursued, returned to the service location, incarcerated and placed on trial under the U.S. Uniform Code of Military Justice (UCMJ).
In severe cases, the trainee could be recycled if necessary to begin the process again. If the individual was deemed by the training command as unfit for service, he or she would be discharged as such and it would be made a part of their permanent record.