There is something called the Virginia Defense Force, which is certainly a low profile outfit. I couldn't tell if they are armed from their website but there strength is about 800. The main object appears to be to supplement the Virginia National Guard in the event of general mobilization and to guard important physical installations in the absence of other troops. It is generally along the lines I was suggesting, except that it is under state control, which may or may not make any difference.
Smuggling, you probably know, has a long and involved history in some parts of this and most other countries with a coastline.
Shoot low, sheriff. They're riding Shetlands!
Underneath the starry flag, civilize 'em with a Krag,
and return us to our own beloved homes!
Buy War Bonds.