I was EMT many yrs ago, but I always have my first aid kit or box handy. Just in the course of going out in the desert, going boating or whatever, it's been opened and used more than a couple of times.
A couple of yrs ago we were headed up to one of the northern lakes with our boat. We came upon one very serious auto accident on the way up there, but paramedics (and air ambulance) were already on the scene. On the way back, we were the second vehicle (first with any first aid equipment) on the scene where a deer had jumped off the mountain above the road, hit the windshield of a passenger car, and slid off the hood and down the hill. The driver had his fingers crushed between the windshield and the steering wheel and two passengers were in shock. We helped out there until the sheriff and paramedics arrived. We stopped for lunch and proceeded toward home, when halfway there we were first on the scene of yet a third accident where a lady missed her turnoff and lost control trying to stop and/or turn. She was dinged up, too.
We had to restock the old' medical box after that little trip.