Hi! Here are some useful resources available online for prehospital anaesthesia
Prehospital anaesthesia handbook
Prehospital anaesthesia AAGBI guideline
BJA podcast on Prehospital anaesthesia
Prehospital anaesthesia in the UK
Prehospital anaesthesia 2001 paper in Military journal
Prehospital anaesthesia -its hard enough IN hospital!
apnoeic oxygenation-essential in prehospital RSI
prehospital RSI SOP Sydney HEMS
Prehospital anaesthesia & analgesia
Prehospital fascia iliaca block
Prehospital and Retrieval Medicine - THE PHARM dedicated to the memory of Dr John Hinds 
Geeat list of materials Minh. Thanks
Couldn’t see the UK HEMS / London SOP here?
I know. I thought Sydney HEMS SOP better example