"polarity wrong?" Depends on the meaning of "civil defense" in the top-level comment. If that means "protecting civilians & civilian infrastructure from milit

"polarity wrong?" Depends on the meaning of "civil defense" in the top-level comment. If that means "protecting civilians & civilian infrastructure from military or paramilitary attack", then "No" is correct. If "civil defense" is so broadly defined that it includes "protecting from normal aging, weathering, and neglected maintenance", then "Yes". (Admission: My sense of such usages may be kinda old. Dad was a Civil Defense Officer in WWII, specializing in poison gas attacks.)