Military and combat first aid.
Have used both in military and civvy situations. Civvy situation was a colleague with me on a training ride. Front wheel went side from under him and he landed square on his chin. Went unconscious for short period. Did all the shock/recovery stuff and - luckily - he was a doctor specialising in emrgency medicine so when he became conscious, he started diagnosing himself:
'Ib schpilt me soff pallet'
'What?'
'Ib schpilt me soff pallet!'
'Eh?'
'I shed, Ib schpilt me soff pallet, oo deff bashted!'
'Ohhhhhhh, you've split your soft palate!'
I was really pleased that all the training kicks in automatically. Everyone should do some - where I live in Germany, you have to do the equivalent of a basic first aid course before you can start learning to drive.