You said that the
"WW1 Draft Registration Card is not an official miltary document". It is not just a head count. It was also to give you uour draft or elligibility status as to your physical well being. It is definately an official military document; because it determines your status if you can be used by the military and the military will draw off that.
What it is not. it is not a definate that you are going into the military. I don't disagree with your basic prism; but it is an official military document and its findings will be contained in your military record and if it figured into it . it would be used at court or a court martial.