Page "National Guard of the United States" Paragraph 16

Though originally state entities, the Constitutional " Militia of the Several States " were not entirely independent, however, because they could be federalized.

According to Article I, Section 8 ; Clause 14, the United States Congress is given the power to pass laws for " calling forth the Militia to execute the Laws of the Union, suppress Insurrections and repel Invasions.

" Congress is also empowered to come up with the guidelines " for organizing, arming, and disciplining, the Militia, and for governing such Part of them as may be employed in the Service of the United States, reserving to the States respectively, the Appointment of the Officers, and the Authority of training the Militia according to the discipline prescribed by Congress " ( clause 16 ).

The President of the United States is the commander-in-chief of the state militias " when called into the actual Service of the United States ".

( Article II, Section 2 ).