That's possible.

But it glosses over the point that the original balance of power between the States and the Federal Government included land forces that the Fed did not normally control. Nor did the Fed have (at that time) the power to collect enough taxes to maintain as large a military force as we have now. The dismantling of that decentralized military is what made something like DHS possible. Its a long game but the country has shifted from one where the Fed had little real power and was focused on providing basic services that only a central government can to a country that increasingly defines itself as the power the Fed wields. And that much power that is so absolutely centralized is a breeding ground for corruption and special interests.

"30 rounds of justice in my magazine?"

That's not justice. That's power. Wielded entirely by the Federal Government... for whatever reasons it does so.

Again, to no fault of the selfless soldier who is serving his country. Just realize that 150 years ago he would have been serving his State and then his Country. Were that still the case something like the DHS would have never been needed in the first place.