I once when I was a very young Private in the army and very gung-ho an event that changed my option on the carrying of medical information in the field occurred. I was on a fire and movement range and I jumped forward at the end of my three step bound and had not bother to look ahead and see that there was a large patch of prickly pear cactus in front of me or wear gloves.

I then walked back to where the medics had parked their amb. When I arrived to have my hundred or so slivers removed from both hands and arms the medic said as she pulled out a pair of tweezers these immortal words "I have never done this before".

From that point on I have always recommended the carrying of quick reference or even small medical text. I would rather have a field medic say, "just a sec I want to make sure I have this procedure down" than "I have never done this before I hope this is how I do it"