The Federalist No. 29

THE power of regulating the militia, and of commanding its services in times of insurrection and invasion are natural incidents to the duties of superintending the common defense, and of watching over the internal peace of the Confederacy.

It requires no skill in the science of war to discern that uniformity in the organization and discipline of the militia would be attended with the most beneficial effects, whenever they were called into service for the public defense. It would enable them to discharge the duties of the camp and of the field with mutual intelligence and concert an advantage of peculiar moment in the operations of an army; and it would fit them much sooner to acquire the degree of proficiency in military functions which would be essential to their usefulness.

To oblige the great body of the yeomanry, and of the other classes of the citizens, to be under arms for the purpose of going through military exercises and evolutions, as often as might be necessary to acquire the degree of perfection which would entitle them to the character of a well-regulated militia, would be a real grievance to the people, and a serious public inconvenience and loss.

Little more can reasonably be aimed at, with respect to the people at large, than to have them properly armed and equipped; and in order to see that this be not neglected, it will be necessary to assemble them once or twice in the course of a year.

The project of disciplining all the militia of the United States is as futile as it would be injurious, if it were capable of being carried into execution. A tolerable expertness in military movements is a business that requires time and practice. It is not a day, or even a week, that will suffice for the attainment of it...

But though the scheme of disciplining the whole nation must be abandoned as mischievous or impracticable; yet it is a matter of the utmost importance that a well-digested plan should, as soon as possible, be adopted for the proper establishment of the militia. The attention of the government ought particularly to be directed to the formation of a select corps of moderate extent, upon such principles as will really fit them for service in case of need.

Where in the name of common-sense, are our fears to end if we may not trust our sons, our brothers, our neighbors, our fellow-citizens? What shadow of danger can there be from men who are daily mingling with the rest of their countrymen and who participate with them in the same feelings, sentiments, habits and interests?

What reasonable cause of apprehension can be inferred from a power in the Union to prescribe regulations for the militia, and to command its services when necessary, while the particular States are to have the SOLE AND EXCLUSIVE APPOINTMENT OF THE OFFICERS?

The militia of the country ... may be usefully and successfully employed against sudden invasions or dangerous insurrections. In times of insurrection, or invasion, it would be natural and proper that the militia of a neighboring State should be marched into another, to resist a common enemy, or to guard the republic against the violence of faction or sedition.