I don't think anything like this is likely to happen but I'm not so naive or with my head in the sand to say it won't or can't happen. As I recall, Virginia passed a resolution after the despicable incidents by "authorities" in New Orleans with Katrina that would prevent something like this from happening in Virginia. And there is now a bill making its way through Richmond to make this law in our state. And do keep in mind that all able bodied men between the ages of 17 and 45 are automatically members of the militia.
"§ 311. Militia: composition and classes
How Current is This?
(a) The militia of the United States consists of all able-bodied males at least 17 years of age and, except as provided in section 313 of title 32, under 45 years of age who are, or who have made a declaration of intention to become, citizens of the United States and of female citizens of the United States who are members of the National Guard.
(b) The classes of the militia are—
(1) the organized militia, which consists of the National Guard and the Naval Militia; and
(2) the unorganized militia, which consists of the members of the militia who are not members of the National Guard or the Naval Militia."
That's one heck of a lot of folks. I would imagine that if Martial Law were ever declared for less than extreme emergency conditions, there'd be a mess of people who would ignore it and band together to protect themselves from whomever was a threat. But who knows. Let's just hope we never see this take place.