The military and national guard aren’t militia, they are armies. A select militia is no militia at all. And professional soldiers can’t replace a militia as it is them who on rare occasion they are tasked with opposing.
At the siege of Boston the Connecticut militia along with the Green Mountain Boys, and the men of Massachusetts showed up to oppose the British regulars. The regulars were professional soldiers. The rest the militia.
Our professional army maybe our ally in liberty today but history has shown that may not always be the case.