I watched it again a few days ago and I have it recorded so I can watch it and be humbled. That Man was and is true hero that stood firm in his belief!
It takes an amazing person to be a combat medic who fully knows they will see combat. It takes an extraodinary person to do that job unarmed. I'm not sure I would have survived combat if I wasn't armed.
He was very brave, the movie I think is a mix of actually two island campaigns into one. In other words they knew he was brave before the big climax on that island campaign with Hacksaw ridge.