I spent 24 years in the military and 22 of them as a Corpsmen, the last 10 as an Independent Duty Corpsman (Provider), so I have had more initials behind my name for medical certs than I can even remember. I have had the unfortunate honor to practice my trade overseas to mostly good result. On the range (even in dynamic courses) I have not had to do anything extravagant, mostly twisted pick a joint, lumps, bumps, burns cuts, scrapes, SPLINTERS, BEE STINGS, poison ivy/oak/sumac and the occasional ear plug the got stuffed waaaayyyy down the ear canal.
IMHO and what used to be professional opinion if you can breathe in and breathe out and conduct life as a “normal” person you should have some form of basic first aid training. I wish they made a course entitled Home Medicine in High School, of course I wish they would bring back shop class too. I have mixed emotions about certifications (probably because most of mine were instructor cert’s and all the baggage that goes with them) . It is not hard to educate yourself in First Aid, “Stop the bleed” basic CPR and air way obstruction. One should also learn a few things about basic medications, Aspirin, Tylenol, Motrin, Benadryl, Insulin, epi-pens, Tec-Nu and Burn Gel are at the top of my list. I guess I should add Narcan for opioid OD nowadays. Information is available and worth more than what Google will cost you.