Once they started mandating helmets, post-crash fire was the next to be dealt with. I heard one of the senior Army aviation safety officers say that he can name off the top of his head every person who has died due to a post-crash fire associated with a crash within design limits. in US Army helos since he was commissioned (20+ years earlier). That's how he demonstrated what they achieved. It's a **** shame that we haven't put a fraction of the attention into addressing a major killer. Then again, in EAB we are still facing a certain number of people who think that a shoulder harness is overkill.