Many police agencies use Citizen Observer Patrols to augment their force. I would have no problem with trained volunteers equipped with radios and GPS trackers acting as another set of eyes for the Border Patrol, but a "militia"?? Not a chance. A bunch of gun-toting, Rambo Jrs wandering around in the desert would turn into a nightmare rather quickly. Forget about the potential body count and lawsuits flying around, it'll probably only be a matter of hours before some of these yahoos get stranded somewhere in the desert prompting a large (and expensive) SAR operation.
I can see it now.....the darkness pierced by the TV camera crew's lights as Floyd, Earl, and Bubba emerge from the rescue helocopter shivering in blankets, dehydrated, and all their hard-earned "militia cred" gone down the drain......