When I became an EMT, in 'bout '77 or so, my issue kit had about four diffenent air splints in them. I only used one once, on a closed fx, seemed to work OK. But there was no walking involved, just a wait for the ambulance. Then a few years later the department took them all away. No reason, they just went. Haven't seen once since.

I have done CPR more times than I care to remember, all with a pocket mask with oneway valve. Worked fine. But all victims did not make it. Not really my fault, all had major closed head injuries, thanks to not wearing a seat belt and being thrown from an overturning vehicle...