To provide for organizing, arming, and disciplining, the Militia People, 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 People according to the discipline prescribed by Congress
Can’t say I agree with your conclusion there, that’s a pretty significant change of meaning. The Militia is explicitly described as something that is organized, armed, disciplined, and trained by Officers.