Back pain
One non US, non Military testimony:
5 years ago I developed pretty severe back pains. In part thanks to a previous thread here on PPRune, referring to previous military studies that Heli pilot are very prone to disco-pathy, I assumed that I should trace it back mainly to a new Heli (one that apparently vibrated differently/more). I put a silicon air cushion to take away the MR vib's. Been happily flying ever since.
So they better spend there money right away on designing some decent seats....
Don't waste time on another study, while keeping injuring back's in the mean while SIR...
m2c
d3