A draft worked well enough in WW II, when the Army fielded one hundred or so divisions. DOD doesn't want larger ground forces than we have now. What do we do?

A draft worked well enough in WW II, when the Army fielded one hundred or so divisions. DOD doesn't want larger ground forces than we have now. What do we do? The disability doctors of the Vietnam days could be very flexible. Would the FBI ask that charges be brought against a doctor who simply objected to the draft and disqualified anyone who was nearly on the borderline?