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My dad was a Search & Rescue technician in the Canadian Air Force from when he was 20-35. He now works part time in triage at the local hospital. I learned a lot of what I know from him.
I myself am pretty well as certified as I can get without teaching EMTS themselves (Canadian Forces Medical Technician) and I'm an instructor for the Red Cross & work with my local army unit training men. I'm 28 now & I've been involved since I was 16.
(Advanced CPR/AED, Standard First Aid, Childcare First Aid, Emergency First Aid, Advanced First Aid, Wilderness First Aid/Downed aircraft scenarios, Mental Health First Aid, & IFAK instructor)
Honestly if you don't have any sort of training what so ever you should be carrying three things:
>Trauma Gauze, Gauze Roll/Bandage, Tape
The best I'd expect someone to do that has no clue is to stop bleeding, somewhat dress it & get help. Burns you may be able to somewhat dress. Everything else is sort of hard to figure out with out training.
As most said above only tourniquet if you know you'll bleed out if you don't and if you know you'll probably loose party of the limb anyways. The position of the tourniquet is hard to decide even I have trouble deciding and I've seen some shit so just do your best.
I really suggest getting at least basic first aid training as it does help. In Canada you can even take basic courses online. In Canada nothing comes close to military first aid and triage if you can get access to it. The next level I would say would be the more advanced courses the Red Cross offers. I don't have much to say about St. Johns Ambulance I'll put it that way.
Get trained, Get kit, & be as proficient as you can in its use.