Dan, then you also know that the newly formed govt was broke, that it barely was able to pay its military officers for services and that the US was in massive debt to its European allies.  Washington had no funds to establish a standing army.  The Framers also knew that there was still great fear/concern about states' rights and the potential threat of an overbearing central govt.  Two major reasons why 2A was included in the Bill of Rights. 
As we know, just because someone may have a physical challenge doesn't mean they are not capable of serving (unless your name is trump and you have a 'temporary' bone spur! LOL ).  Your example is a hollow man argument.