They would also be incredibly vulnerable. Such a tiny object, spewing out great volumes of heat, would stand out from the terrain "like dogs' balls". Seeing th

They would also be incredibly vulnerable. Such a tiny object, spewing out great volumes of heat, would stand out from the terrain "like dogs' balls". Seeing that they would necessarily be close to the headquarters, a couple of heat-seeking missiles would do wonderful damage. Way back around the 1960s, the big thing was for hovercraft to be the amphibious landing craft of the future. However, it was soon found that they weren't as quiet and unobtrusive as they were originally envisioned to be, and drew attention very quickly.