Without giving any real info away, I'd say the DUMBS exist. Several years ago a family member who worked in Defense was at a facility somewhere in a desert. He was blindfolded, taken on a car ride of about an hour's time. Still blindfolded, led into a building and elevator that went about (by his estimate) seven stories deep. Shown what the problem was with whatever widget they were building, helped fix it and back to where he came from.