Candidate Trump conveniently cannot remember the name of the Doctor who diagnosed him with a bone spur in his heel so bad it would exclude him from the draft.   I wonder how many other "special" deferrals that same "unremembered"doctor granted for "favors" from the wealthy and more fortunate like Trump`s father.  Throughout history many conscriptions took place in most major societies..but it was always possible to pay a "tribute" to get passed over.   
There were probably a few unpopular Roman Senators who were suddenly needed by Roman legions at the front, fighting the barbarians, who, being important leaders needed at home as well,  preferred to "buy" their illness and excuse for not serving.. like so many so-called political leaders who went on to involve this nation in war without having served in uniform.