Re: "158 of which are Category 1"
""Severe illness." Eh?"
I THINK this is a reference to the unique nature of the helmet: its a kind of hybrid virtual reality device which integrates "real" vision with the inputs from cameras and other sensors dotted around the aircraft. For instance if the pilot looks "down" he can "see" right through the aircraft to the ground below.
It must be bloody difficult perfecting that integration, and I can see that getting it wrong could have a disturbing effect on the pilots spatial coordination, vision and concentration. Imagine seasickness at high G and/or Mach1.5 with vision on the verge of hallucination
Biting the hand that feeds IT
