Basically, Congress can force every high school graduate to have attended "militia" training on the laws governing use of force and safe gun handling. They are empowered to "prescribe" such "discipline" on the militia. But whether they choose to do that or not, they cannot prohibit people from keeping and bearing arms. >

Pretty sure this would solve a lot of issues surrounding the Second Amendment, as well as many others. If everyone is well-trained by the same precise regimen, then everyone can be expected to comport themselves properly moving forward. Works for public education, would work for this.