Gamma World: The Infinity Arc
This group splintered off the Restorationists. They actively seek remote, primitive communities, so they can build fortifications, train troops, and improve their standard of living. Even if the community cannot be persuaded to cooperate, the Peace Brigade will impose the urban development by force. Their core believe is that strong defense makes a community better, but they overlook that thick walls tend to isolate the community from the rest of the world.
Their symbol is a crossed shovel and sword set on a blue field, which they post on the walls they establish.