Subs, commanders and grands!
The pyramid of commanders which they wanted to establish was simple, but yet very effective. Tutan established a relentless hunt for intelligence, and needed any people above the average score, to act as commanders!
Since the average IQ for rhinos was about sixty points, the ideal, potential commander would need to score anywhere between sixty-five and seventy points. An ideal commander should be able to think out of the box, adapt against uncertainties, and follow any practiced, safety procedures accordingly!
In brief, that was a lot to ask for. However, the odds of finding smart people within this sea of idiots, were greater. Tutan found too many of them even, nearly a hundred, smart people!
The scans were made in a rather clever, and efficient way, as an IQ scanning device was latched on one of the base's exits! It even picked up the genetic codes and ancestral upbringing of the scanned rhinos, which explained each individual IQ in depth.