It is a pity that this is not also being done in the UK. Physiotherapy at UK SH stations is an expanding trade and much was apportioned to NVG when similar research was conducted a few years ago. The system did not like what was incoming and the research was terminated.
Mk 4 helmets do not reduce rotary noise to levels that are acceptable unless used in addition to (yellow) sponge ear defenders.
Having IRJ in your line of vision can contribute to cataracts in later life.
Seats that stop bullets but destroy any hope of posture can break the best of them.
.....and does a Puma crewman have a crash seat at all yet?