If you really want to be useful to others and have security and some leverage when TSHTF, or even in just tougher times, get as much medical training as you can. Attend CPR classes, get certified in whatever you can, maybe even do EMT stuff if you can. Don’t get into the doctor/nurse line unless you really want to do it, but get as much practical stuff that you can get, and as much free training as you can get. In times of need you will be better than nothing and you’ll know how to do basic things that just may be enough to save people (including yourself) and you might find yourself in a more leadership role somewhere in the chain, if you’re a knowledgeable person and show you can learn/be trained.