The real thing, expedient stuff developed or collected at Oak Ridge, and actually tested in the field. Which you can't say about e.g. a number of Civil Defense

The real thing, expedient stuff developed or collected at Oak Ridge, and actually tested in the field. Which you can't say about e.g. a number of Civil Defense shelter designs dreamed up by bureaucrats inside the Beltway that have insufficient ventilation (heat and humidity of too many people).