There is one great assumption that I have to question here.

I really wonder if injuries are that much different between the military and the civilian population.
I especially question it when I am looking at industrial accidents.

And before anybody gets jumpy, yes, I know bombs and bullets are terrible things but so are explosions in refineries, flour mills or steam plants, and so are cables bolts and tension rods when they fail.

Edit: I thought Art's comment, "In normal life, a time before trauma centers, a doctor might only see a major trauma case every year or so. He operated on several a day for a year. He saw and did more in one year than most doctors did in their entire career." was worth repeating.

We have developed trauma into a civilian medical specialty now.
We have surgeons who work steady on amputated limbs, or severe burns, or whatever.
Any large city supplies more than enough serious accident cases to keep those specialists busy.
You can add to that the steady stream of shooting, stabbing and beating victims they get to see on a regular basis too.