Video posted online by the former professional soldier show him putting his training to good use by bandaging a Kurdish fighter who has been shot in the face during a clash with jihadis.
'I accomplished more good in those 20 hours than the previous 26 years of my life,' he said. 'I dragged a man who had been shot in the face to safety and patched him up, while many others stood around in shock.
'I am unsure if my actions saved his life but I truly hope so.'