I doubt that is what drove this. I'm sure they teach them that sort of thing so they know how to treat themselves in a pinch if they are on there own and can't see a real doctor. The problem is that some of them are too self confident and a little dumb so they think it is a fine idea to give it a go during every day life even when there is a doctor available to them. Think, "I'm not lost and don't need to ask for directions I'll just follow the north star like they taught us."
I've got family who is ex elite forces, and I met a number of his comrades in arms at his wedding last year. Cocksure and self-confident? Certainly. A little dumb? I can say without qualification that they are not.