NASA is investigating how to use Kevlar to soften helicopter crashes. If you consider that, since 2001, the accident rate for civilian helicopter use per 100.000 flight hours has been 40% higher than for general aviation fixed wing aircraft (1), then I hope this will eventually help mitigate some of the fatalities in those crashes. Especially because I plan to skydive from some in the future :)

(1) NTSB Aviation Accident Statistics