Article I, Section 8 (Powers of Congress):
The Congress shall have Power To ... provide for organizing, arming, and disciplining the Militia ..."
That doesn't place contraints on what a militia is? It gives Congress the power to define a militia, which is exactly what Congress did when they wrote the Militia Act of 1792.
You "see nothing" indeed. Like that means something.
Which specifically restricted Congress to regulating the ACTIVE duty militia. Not the rest of us who could be subject to militia call up, but aren't. Not that I expect an on topic and cogent answer from you.