While the Militia has been neglected since the 1830s, it's still there.
I think we need to encourage private ownership of our standard military rifle, and have folks learn on their own how to shoot them. These were the original purposes of the Department of Civilian Marksmanship (once part of the US Army and in charge of selling surplus rifles) and the National Rifle Association (started by Civil War vets who were appalled by how poorly urban recruits could shoot).
These institutions still exist; I bought my first M1 Garand from the old DCM, I bought another (as well as a Bushmaster "service rifle") from the Civilian Marksmanship Program, now operating with a congressional charter, and with the same mission. And while the NRA ain't perfect, the complaints I've heard are often about how they cling to their original mission (training and competition) and aren't political enough.
Many people in our gun club would not be surprised to hear the governor on the radio asking for volunteers to muster out with personal weapons, it's happened before.