Prepping for Armageddon isn't in and of itself a bad thing. Prepping for Armageddon isn't far off from prepping for a massive natural disaster. I'm not saying buy crossbows for when Electricity magically stops working or anything, but prepping isn't totally bad.
The problem with "militia" today is that the image conjured isn't the Minutemen of 200 years ago. It's a bunch of white supremacy anarchists running around in camo reliving Deer Hunter flashbacks. If this would be worthwhile, you'd have to start with the war of words. Call yourself the XXXXX State Civil Defense Force. Anything but militia.