good lesson on the "living constitution"
Militia were a state power since the beginning. State Militia "augmented" federal forces and were 2/3 of US forces in every war up to Spanish War. By the time of the invasion of Cuba, magazine-loading rifles meant that nobody was making cartridges on the spot like at Bunker Hill...they had to have factory made ammo in the right size, at hand, immediately. Since every state used a different rifle it meant NY Militia had to use NY ammo and CA militia hand to use CA ammo and neither could use federal US Army ammo. No problem, just make sure the boxcars stayed with the passenger freight, right?
The invasion force at Tampico was supplied by a 1 track rail line. Nobody got their own bags.
After this fiasco the Dick Act of 1906 offered states federal arsenals and armories and uniforms in exchange for federalized training of militias into fully-compatible forces. This was reinforced by the National Defense Acts of 1917 and 1947 which gave them the same ranks and jobs as the federal military, and assigned state units set tasks within the federal military.
All this means, some 100 years later, you imagine that state militias are over.
But the practice of 100 years of -statute- cannot erase the Constitution. Every state governor can raise a militia independent of the Feds.
The core joke of Hitchhiker's Guide to the Galaxy is that of course no civilization would develop personal computers with instant remote database recovery, and then waste this technology to find good drinks.
Steve Jobs has ruined this joke.